Denkmeier BINOTRON-27 User manual

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BINOTRON-27
Owner's Manual

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2.Table of Contents
3. Diagram of Parts
4. Eyepiece Holder Diagram
5. CollitronTM Rings and Collimation ithout a Telescope
6. Collimation ithout a Telescope ctd, Collimation ith a Telescope
7. Collimation ith a Telescope/ Field Chart
8. Collitron Ring Tightening Tool, The Power x Switch
9. Newtonian Telescopes
10. Newtonian Telescopes ctd
11 .Refractor Telescopes
12. Refractor Telescopes ctd
13. SCT Telescopes
14. Optional Accessories: OCS-A45, Eyepieces
15. Optional Accessories: Filter Switch, Filters
16. arranty and Contact Information

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Diagram of Parts
The BINOTRON-27 Super System has been designed to focus at three magnifications in irtually any telescope
designed for typical single eyepiece use. Not only is focus achie ed, but three powers are accessible using the
patented Power x Switch while using only one pair of eyepieces.
Becoming familiar with the arious parts of the B-27 Super System will be ery useful and allow smooth and
trouble free operation. Obtaining focus in arious telescope designs is dependent on using the B-27 Super
System correctly. In the following pages, there are descriptions and pictures detailing proper usage for
Newtonians, Refractors and SCTs. Importantly, become ery familiar with the diagram of the B-27 CollitronTM
Eyepiece holders on the following page. Otherwise, incorrect parts of the eyepiece holder assembly will be
turned at night during use in the field and this will become frustrating. By spending time indoors in the light of
your home and using the eyepiece holders correctly, misidentifying the eyepiece holder parts at night can be
a oided.
Referring to the abo e diagram, all parts are required when using a Newtonian Telescope. See the Newtonian
Telescopes Section for specific instructions. When using a Refractor and other scopes that work similarly such
as classical cassegrains, Mewlons, Planewa e Telescopes, some Maksuto s, and many Ritchey Chretians, the
parts labled D and E are not used. refer to the Refractor Telescopes section. In SCTs, the parts labeled D, E and
F are not used so refer to the SCT section. Specific use is explained with more detail in each of the sections on
Newtonians, Refractors and SCTs. So, please learn how to properly use the B-27 Super System by reading the
sections on any telescope that you will be using. It is ery simple, as long as the brief instructions are properly
followed.

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Eyepiece Holder Parts and Use
The patent pending CollitronTM equipped eyepiece holders are a Denkmeier inno ation that we are ery excited
about. The Bino iewer can be collimated in a minute or less and ery easily using this feature. This is thoroughly
explained in the page following this one. See the ideos at denkmeier.com on “Choosing A System” page.
Howe er, the Collitron Ring is not the only feature that is special about the B-27 eyepiece holder. The diopter
rings on each eyepiece holder allow the user to obtain a ery sharp focus for indi idual eyes. Therefore, those
without perfect 20/20 ision can adjust focus for both the right and left eye while iewing through their B-27
Bino iewer System. In fact, these new focusing mechanism do not rotate the eyepiece. The eyepiece mo es up
and down in a ery smooth motion. The focus adjustment has been set to an ideal speed as well. A change is
easily obser ed, but the motion is still considered to be "micro".
Loading the Eyepieces
The top "Eyepiece Locking Ring" (EPLR) allows the eyepiece to be inserted smoothly by turning this uppermost
ring counter-clockwise and remo ing the Dust Plugs. This allows an internal self centering split ring to expand.
Once the eyepiece barrel is fully inserted, the Locking Ring is then turned clockwise until the eyepiece is held
securely. O er tightening is not necessary but the ring should be turned to a point where it is nicely finger-
tightened.
Focusing Individual Eyepieces
Now, the diopters should be turned upward but only
slightly by rotating the Diopter Ring
Clockwise. If both Diopters are mo ed upward so
that perhaps the second white gradient line below the
+ sign is showing, each diopter may now be used at
the telescope and be mo ed both up and down for
sharp indi idual focus in each eye. Each person's
eyes may focus differently so the indi idual using the
B-27 will want to take note of where the diopters are
set for best focus so that this can be quickly readied
for each obser ing session.
Note: It is our opinion that focus should be monitored
and adjusted as needed during a nights' obser ing.
Rather than assuming one is in perfect focus, we ha e
found that it is essential to check focus of each
eyepiece periodically as sky conditions change and
the scope is mo ed to different locations of the sky
throughout the night. Viewing in proper and sharpest
focus is too important to ignore or lea e to chance. It
is our recommendation that you use the focusing feature of the B-27 as often as you feel necessary! E en when
iewing with single eyepieces, one should be checking focus frequently. The same holds true for iewing with
the B-27 Super System.
Do Not Over-Tighten The Diopter Ring
It is recommended that the eyepiece barrel be fully inserted into the eyepiece holder initially with the diopter
fully bottomed out (turned clockwise). Howe er, it is not necessary nor ad isable to bottom out the diopter too
tightly. Over-tightening the diopter mechanism when turning counter-clockwise after it bottoms out can
then make it hard to free when turning clock-wise, and the lower Collitron Ring may then also become
loosened unintentionally and eyepiece holder collimation will have to be performed again. This is only
somewhat incon enient though and can be quickly taken care of by using the Collitron Rings to collimate the
BINOTRON-27. You will find that this is a fast and simple process, and e en enjoyable to many. (see pages 4-6)

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Collimating The BINOTRON-27TM
Collimation is Easy! Below is a Brief Explanation Followed by a Very Simple Procedure.
Many Telescope users become ner ous when faced with the prospect of collimating an optical instrument.
Howe er, this is required if optimum performance and aberration-free images are to be obtained. Generally
speaking, telescope components such as mirrors and lenses must not be tilted or shifted from an ideal
relationship to one another or aberrations in the focused and defocused image will be seen. In the case of a
bino iewer, when we are referring to "collimation", we are actually dealing with alignment of the left and right
eyepieces so that they form a single image when merged. An object seen in the left eyepiece field at a certain
location should be seen at the same location in the right eyepiece. So we are not dealing with tilting optics or
aberrations, because a poorly aligned bino iewer will generally not introduce aberrations, only a "double
image". This poorly merged double ision results when the target object such as a planet or star is located in
different areas in each eyepiece field. A ideo on the “Choosing A System” webpage demonstrates this.
In order to mo e the object to the same exact area in each eyepiece field, we mo e the eyepiece holders, not the
object! The Collitron Eyepiece Holders ha e been designed to shift in a 360 degree direction on a flat plane.
Note that we at Denkmeier "set" the prisms first, and the fixtures hold these prisms in place permanently. The
Final Collimation using the Collitron Holders can be fined-tuned so that e en the highest power images are in
the same location in each eyepiece field. Once this is done, the bino iewer will gi e extremely relaxed, two-eye
iews at all magnifications. Collimation will become so quick and easy, that it may be repeated as often as you
feel the need. We e en feel that the Collitron System makes this process enjoyable.
Preforming Collimation
Load your eyepieces into the holders first before loosening The Collitron Rings. See preceding page.
The diagram at the right illustrates how the Collitron Ring is loosened. It should be rotated counter-clockwise to
a point where the black parts abo e the Collitron Ring can be grasped and the entire holder may be shifted in any
directions. Do not o er-loosen the Collitron Ring. The goal is to loosen it only enough so that both the right and
left holders can be mo ed in any direction in a flat plane. If
the Collitron Ring is loosened to much, the eyepiece holder
can tilt. The Collitron Ring must only be loosened enough
so that the eyepiece holder can slide in all directions in a
flat plane. You are now ready to collimate. (See Videos)
ithout a Telescope
Firstly, we will offer a ery simple and excellent
collimation method. Our B-27 Optical Collimation Device
is a ailable as an option so that your Binotron-27 may be
collimated at anytime, indoors, without a telescope. This
de ice threads into the bottom of the Bino iewer or Power
x Switch and a beautiful in-focus target can be seen in both
eyepiece fields. It contains a fully coated optical lens, and a
laser engra ed target. A separate instruction sheet is
pro ided.
Simple and Fast Procedure
1.Load eyepieces into the bino iewer eyepiece holders by following the instructions on page 4.
2. Thread the B-27 Optical Collimation De ice into the bottom of the Bino iewer Power x Switch
3. View the target by looking through the eyepieces and facing a light source.
4. Make sure the target is in sharp focus for each eye. Consult B-27 Collimator instruction sheet.
5. Loosen each Collitron Ring a bit so that the Upper sections of the eyepiece holder can be shifted. A small

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amount of friction should be present when shifting the holder. Note: The range of motion of the holder is quite
limited but a small amount of mo ement goes a long way in relocating an image seen in the eyepiece field.
Recap: Loosen the Collitron Rings just enough so that the eyepiece holders slide ( but do not tilt) a small
amount in any direction.
6. View the B-27 Collimation target while sliding one or both holders in a flat plane. You will notice
that the B-27 Collimation target becomes double, and ery uncomfortable to obser e with two eyes, and then
merges and becomes one single image that is comfortable to obser e as the holders are shifted.
7. When the image becomes ery comfortable to iew, tighten one Collitron Ring down firmly.
8. Now, while looking through the bino iewer with both eyes, close one eye and iew the target carefully with
the other eye. While iewing the target, obser e an area of the image carefully and now open the closed eye so
that you are using both eyes. Did you notice a double image of that target area that quickly came together as a
single image after a ery short delay? If so, slightly shift the holder with the still-loosened Collitron ring in ery
small increments. Test again by repeating the one-eye blink method. You will quickly obtain an ideal holder
position and there will be no delay in achie ing a perfectly merged single image with both eyes. This process
should take minutes or less once you become accustomed to the process. Once you ha e found this position,
tighten down the remaining loose Collitron Ring. Check things again using the same blink method. After a few
times, this process will become easy, rewarding and fun! You will ha e mastered BINOTRON-27 Collimation.
Collimation Using a Telescope
The same method outlined abo e can be used in a telescope. Rather than using the optional B-27 Optical
Collimation de ice, just focus on a planet or star field in your telescope. Carry out the same procedures as
described abo e, only the object iewed in your telescope will be your target. While collimating on astronomical
objects using your telescope at night works well, it may be easier if your telescope can focus on con enient
terrestrial targets in the daytime since they do not mo e and you are working with the holders in bright daylight.
In fact, we will outline a ery objecti e method to test collimation in daylight using a telescope below. It should
be done in daytime using a fixed target. Of course, ery large telescopes may not be able to find terrestrial
targets to focus on. In those cases, collimate while iewing astronomical objects, or purchasing the optional B-27
Optical Collimation De ice .
Daytime Collimation Using a Telescope (Refractor or SCT)
Setting Vertical Target Location Setting Horizontal Target Location
The main goal when collimating is to achie e a ery comfortable strain-free iew while using both eyesin your
bino iewer. If a ery objecti e, but somewhat more time consuming method collimation is preferred, we outline
the following procedure . Once the Horizontal and Vertical positions of a target become identical in both the
right and left eyepieces, collimation may be considered to be of a ery high order and can be objecti ely
measured. Please refer to the diagram abo e. The Procedure is outlined on the next page.

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Note: Some degree of offset in the Horizontal position is acceptable and can e en increase the 3-D perception
that many obsr ers report when iewing planets and star clusters! Whether such offset in the horizontal aspect
becomes uncomfortable may depend on the indi idual and the amount of offset employed. Feel free to
experiment! On the other hand, ertical positions of a target in the right and left eyepiece field must be ery
close if not exact, or eye strain will occur.
Procedure
1. Focus on a nearby target and place that object close to the ertical edge of the eyepiece field. It should not
touch the edge of the eyepiece field but be ery close to the edge. Set the target in either the right or left eyepiece
only. It is best to start iewing with the eyepiece where the target appears closest to the upper ertical 12 o'clock
position. The other eyepiece will show the target in a lower position further down from the fields upper edge.
2. Now examine the target in one eyepiece only where the target is ery close to the field edge in the ertical
position. If necessary, mo e the telescope to place the target there, as close to the field edge but not touching.
3. Look in the other eyepiece. Is the object in the same position or further down from the field edge?
4. Adjust the eyepiece holders after loosening the Collitron Rings until the object is in an identical
ertical positions in each eyepiece field in relation to the upper field edge. This can take a few minutes.
5. Check the horizontal position as well. Alternating between ertical and horizontal positions while adjusting
the holder will e entually result in achie ing a ery high order of alignment. Yes, it takes some time and getting
used to, but it is a ery objecti e measure of the degree of collimation when both ertical and horizontal
positions of a target are identical in both the right and left eyepiece fields!
Setting Collitron Holders For Vertical Alignment Setting Collitron Holders For Horizontal Alignment
Print This Page as a Reference to Use During Actual Collimation Procedure With Telescope In Daytime
Notes:

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Collitron Ring Tightening Tool
We pro ide a tool that allows the user to tighten the
Collitron Ring if they feel that finger pressure is not
adequate. This is generally unnecessary but since the
amount of "finger strength" will ary from person
to person, we felt that including a tool was probably a
good idea. The Collitron Ring features three holes
so that at least one can easily be accessed no matter
where the Collitron Ring ends up in rotation after it is
finger tightened. Please do not o er tighten the
Collitron Ring! The ring should only be tightened to
the point where it will not become loosened while
operating the upper black rings used for locking and
unlocking the eyepiece and adjusting indi idual focus
(see page 3).
The Power x SwitchTM
The Dual Arm Power x Switch is our patented de ice in ented by Russell Lederman of Denkmeier Optical.
It functions in arious ways, depending on the telescope type being used. The three magnification factors
produced are different depending on the
telescope. This is explained in more detail in the
sections labeled Newtonian, Refractor and SCT
use. The name "Power x Switch" is actually
erbalized without the "x". We needed to add
the "x" for trademark purposes. A fully coated
optical doublet is housed in each carrier arm
(two arms). So there is a low power mode, a
mid power, and a high power mode. The low
power lens is always housed in the lens carrier
installed on the Logo-Side of the Power x
Switch Body. The non-Logo side contains the
highest power lens. The Mid-Power is achie ed
with both Power x Switch arms in the out
position. Only one arm can be mo ed inward
into the light path at a time, and should be mo ed in
completely, until tra el terminates.
The illustration at lower right shows the low
power arm on the Logo-Side fully inserted into
the light path of the bino iewer. The
magnifications that result are indicated in the
photo. These magnification factors are
multiples of what a single eyepiece would
produce. Ex: If an eyepiece renders 100X when
used as a single eyepiece, it will produce 130X
when used in the B-27 Super System with the
Low Power Arm mo ed to "IN" , when a
Newtonian or Refractor is used. It will produce
only 66X when used in an SCT. This is
explained in more detail later in this manual.

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Using Newtonian Telescopes
Please refer to the Parts Diagram on page 2.
The B-27 Super System is shipped in the case fully assembled and ready for use in Newtonian Telescopes. What
you will recei e is shown abo e. Note that the illustration also shows the B-27 with optional D21 Eyepieces. The
D21 Eyepieces are not included unless you ha e ordered them. The Super System Assembly consisting of Power
x Switch, 2" Part O Nosepiece, Middle Newtonian Spacer with Sil er Lock Ring, and finally the Multi-Purpose
OCS Cell must be inserted fully into your focuser until the Power X Switch is flush with your focuser drawtube.
1.Now, the Lower Power Arm is pushed in. Rack your focuser drawtube in until focus is achie ed.
2. If focus is not achie ed, remo e the entire assembly from the telescope and thread out the Middle Newtonian
Spacer and Sil er Lock Ring from the 2" Part O Nosepiece. The Sil er Lock Ring may be a bit tight. Unthread it
counter-clockwise to allow the Middle Newtonian Spacer
to be lengthened outward (unthreaded). Try to focus again
by sliding the entire system back into the focuser until
flush. Remember that the Low Power Mode requires the
most in-tra el of your focuser. The Middle Newtonian
Spacer must be lengthened until you can rack inward just
past focus. It is important to be able to go inward past the
focus point, and then outward to a perfect focus in order to
be sure that perfect focus has been achie ed. E ery scope
is a bit different which is why the Middle Spacer's ability
to be lengthened is so important. Once the Middle
Newtonian Spacer has been set properly, the Sil er Lock
Ring can be threaded back downward until flush with the
2" Part O Nosepiece. If focus is not achie ed in Low
Power Mode, please see "Troubleshooting".

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Newtonian Use (continued)
Once Low power Focus has been achie ed, the next is mid power. Mo e the Low Power Arm completely out.
Now both Power x Switch arms are in the
out position. This is mid power in
Newtonian Telescopes. You must rack your
focuser draw tube outward until focus is
achie ed. This is considered by many to be
the ideal power mode for obser ing planets.
Only the front OCS Lens is being used now
to bring focus through the B-27 Body to
your eyepieces. While all of the Power x
Switch optics are of ery high quality, many
belie e that the fewer optics there are in the
light path, the better the image quality.
The next power mode is the highest. This is
achie ed when the arm on the non-logo side
of the Power x Switch is mo ed into the light
path. This requires the most out tra el. If you
rack your focuser drawtube completely out
and still do not achie e focus (which is
possible with many low profile focusers),
loosen your drawtube thumbscrew and pull
the bino iewer assembly out a bit until you
achie e focus and then go outward a slight
amount past that point. The 2" tubes of the
Super System Assembly pro ide an
abundance of contact area allowing this to be
done without any issues. Hopefully, you can
still rack inward and achie e low power focus when pushing in the logo side arm. It is possible that with some
telescopes, all three focus positions will not be reached without the need to withdraw the Super System
Assembly outward in highest power mode. This depends on how the Newtonian mirrors, and focuser ha e been
spaced.
Trouble Shooting
Images seem poor:
In the unlikely e ent that this occurs, check collimation of the telescope. with the B-27 Super System in place.
Diffraction patterns should be unchanged when using the B-27 Super System as compared to a single eyepiece.
Howe er, the scope should ha e the collimation fine tuned using a stellar diffraction pattern in certain cases, for
optimal performance. This may be caused by focuser drop due to the weight of the B-27 Super System. In fact,
many obser ers choose to re-check collimation when the scope is pointed at arious areas of the sky! It is always
a good idea to be able to examine a diffraction pattern and fine tune the Primary Mirror collimation so that the
airy disc of the diffraction pattern appears at dead center as focus is closed down to a point.
Do I need a counterweight?
Yes, ery likely. Any hea y accessory should be counter weighed. There are so many methods that one can
employ and there is a wealth of information on the internet to help you decide which one is best for you.
I can't reach focus in Low Power Mode no matter how far I lengthen the Middle Newtonian Spacer.
Call us. We can pro ide a spacer cell that threads between the Newtonian spacer and the OCS Cell and this will
sol e the problem and allow the Newtonian Spacer to be also be closed back down a bit. Another alternati e is to
mo e your primary mirror collimation bolts higher, pushing the mirror a bit closer to the secondary mirror. A
third alternati e requires your truss poles to be trimmed slightly. In solid tubes, the mirror cell can be mo ed up.

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Using Refractor Telescopes
In order to achie e a focused image, Refractors require optical assistance when using a bino iewer. Our Power x
Switch and Optical Corrector System (OCS) allow focus to be obtained. The BINOTRON-27 Super System
must be used correctly for focus to be achie ed. We outline the methods below. There are a few refractors that
were/are specially shortened in order to allow a bino iewer to focus. These can be made to work in a different
way than the typical Refractor. We will co er this special case at the end of this section.
In the illustration on the right, the OCS Cell has been
threaded into the end of a 2" star diagonal on the telescope
side. This now allows focus to occur when the bino iewer
is loaded into the eyepiece holder of the star diagonal. The
Middle Newtonian Spacer is not used for refractors.
Refractor Use
1. Remo e the Middle Spacer with Sil er Lock Ring and
the OCS Cell from the 2" Part O Nosepiece. The Part O
Nosepiece remains in the Power x Switch.
2. Thread the OCS Cell that has been remo ed from the
Middle Newtonian Spacer Tube into the telescope-side
tube of your 2" star diagonal.
3. Load the Bino iewer with Power x Switch and 2" Part
O Nosepiece into the eyepiece holder of the star diagonal.
4. Now, push in the Low Power Arm (Logo-Side) of the
Power x Switch. In order to reach focus, the drawtube of the refractor must be racked inward. The magnification
factor is approximately 1.3X. In other words, if a single eyepiece produces 30X when used in mono-mode, it
will now produce 39X in the bino iewer or 1.3x30x=39x. These figures are approximate and can ary slightly.
5. After obtaining focus, mo e the Low Power Arm out. With both arms of the Power x Switch in the out
position, mid power results with approximately a 2.3X magnification factor. Again using the abo e example,
69X will be the result. Various brands of Diagonals may affect these magnification factors slightly.
6. Now, the final highest power magnification of the Power x Switch can be implemented by mo ing the Non-
Logo Side Power x Switch arm inward. The focuser of the refractor must be racked outward to reach focus. The
magnification factor becomes 3X or again, using the abo e example results in 90X. Note: many Refractors ha e
only a small amount of o erall draw tube tra el. Those scopes with less than 3.5" of o erall tra el may fail to
reach focus in the highest power mode. This issue can be eliminated by withdrawing the star diagonal from the
telescope until focus is reached. Use of a short 2" extension tube is also a ery good remedy.
Denkmeier or illiam Optics Diagonals
When using our Denkmeier Optical Diagonal or a
William Optics Diagonal, the position of the OCS
Cell can be placed closer to the diagonal mirror. In
the illustration on the right, the 2" diagonal tube has
been remo ed and the OCS Cell has been threaded
directly into the diagonal body. Then the remo ed 2"
diagonal tube has been threaded into the OCS Cell
female threads. All threads are 48mm male or female.
By placing the OCS cell directly onto the diagonal
body, two things are accomplished - The focus
position is brought more inward toward the telescope,
and the magnification is slightly lowered in all Power
x Switch settings.

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Trouble Shooting
Scope is Unstable Due to eight
As with all hea y accessories, adding the B-27 to your Refractor requires careful counter-weighing.
Images Seem Dim
Most refractors ha e relati ely small aperture. Images will be dim especially at 3X if high power eyepieces are
used. Of course this depends on the intrinsic brightness of the object being iewed. While deepsky objects can be
iewed satisfactorily, this depends on sky darkness, brightness of the target, and the focal length of the eyepieces
being used. Refractors excel on planetary and lunar iewing with a bino iewer unless the obser ing site is a dark
one. Expectations should be realistic when using a small aperture telescope.
High Power 3X Mode ill Not Focus
The Mid and High Power Modes of the Power x Switch require the focuser of the Refractor to be racked
outward. Many refractors ha e only a limited o erall length of the focuser tube. If the focuser drawtube has less
than 3.5" of o erall tra el, it is possible that the highest and e en the mid power settings will fail to reach focus
when the tube of the refractor is fully racked out. Two Inch Extension Tubes are widely a ailable and some cost
under $20. It is a good idea to obtain one. Another quick remedy is to just pull the star diagonal out of the
drawtube until focus is reached, and then lock the diagonal in with the drawtube thumb screw. Be careful! You
must use good judgment when ascertaining whether this solution is the proper way for you. Note that refractors
ary widely and the focal plane position in relation to the focuser aries as well. Do not withdraw the B-27 from
the diagonal eyepiece holder as this is not a good solution and will likely not allow focus to be achie ed.
Special Shortened Refractors
Some refractors ha e been made with remo able extensions so that a bino iewer will focus without the need for
optical lenses. If the BINOTRON-27 Super System is to be used with the Power xSwitch and OCS then follow
the Refractor Instructions and make sure that the remo able extension tubes are installed in your refractor so that
it operates like a con entional scope. Then the B-27 will operate properly. If the extensions are remo ed from
your scope, then the BINOTRON-27 may reach focus without the OCS installed in the diagonal. A third method
is to thread the OCS directly into the 2" Part O Nosepiece. Then the Power x Switch will function. The refractor
must still be shortened (no extension tubes) but this may require more outward racking than is a ailable unless a
mid range extension tube has been pro ided. If not, purchase a 2" extension tube with about 2" - 3"of length. If
necessary, the extension can be slid in or out of the telescope to hit all focus positions.
Terrestrial Viewing-Because many objects are close to the obser er, focus is pushed outward . A long extension
tube should be placed in the telescope before the star diagonal so that the diagonal and B-27 Super System can
slide outward as needed. Rule: Close Targets require more outward sliding of the star diagonal.

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SCT TELESCOPES
Schmidt Cassegrain Telescopes are ery ersatile and the BINOTRON-27 Super System works in a ery
different way. The typical SCT has a mo ing primary mirror. As it is mo ed toward the secondary mirror
mounted on the front corrector plate, focus is pushed out of the rear of the optical tube. This pro ides a great
amount of "back focus". Therefore, the OCS cell is not used, or required. In fact, the focus is mo ed so far
outward, that the Power x Switch can produce true focal reduction when the Low Power Arm is pushed in. This
is ery important because the typical F/10 ratio of an 8", 9.25", 10" or larger SCT produces a ery large image
scale. The ability to implement focal reduction changes this F/10 to approximately an F/6.6 ratio. This makes
deepsky objects more compact due to lower power. The object becomes easier to see. The Mid Power setting
increases the focal ratio a bit. The Power Factor is about 1.15X and this is due to the interaction of the primary
mirror with the telenegati e secondary mirror. The highest power mode becomes approximately 2X since no
OCS Cell is being used.
SCT Use
1. Remo e the Middle Newtonian Spacer with Sil er
Lock Ring and the OCS Cell. These are not used in
an SCT. The illustration at right shows the
BIONTRON-27 ready to be used in an SCT.
2. Load the unit into your 2" Star Diagonal. Note: An
optional 1.25" nosepiece is a ailable for 1.25"
diagonal use, though use of a 2" diagonal is more
stable and recommended.
3. Start with both Power x Switch Arms in the OUT
position as pictured at right. This is the mid power
mode. Point the scope to a bright object to start.
4. The focuser knob of your SCT Scope must be
turned counter-clockwise until focus is achie ed. It
will likely require many turns and this will ary from
scope to scope.
5. Once focus in Mid Power Position is reached, mo e the Logo-Side Low Power Arm inward. This is the Focal
Reduction Mode and produces approximately F/6.6. In other words, if a single eyepiece produces 50X, this
reduction mode will produce 33X. Se eral turns of the focuser from the Mid Power Position in a counter-
clockwise rotation will be required to reach focus.
6. It is always ad ised that when lea ing the Reduction Mode, mo e the Reduction Arm out and once again
focus in Mid Power Mode. This requires se eral clockwise turns of the focuser knob of your SCT. One focus is
achie ed in Mid Power, mo e the Non-Logo-Side Arm in. This is High Power Mode and produces a 2X factor.
A 50X power eyepiece used singly, will operate at 100X. in the B-27. The focuser knob must be rotating
Clockwise from the point where mid-power focus was.
Trouble Shooting
I cannot reach focus in Reduction Mode.
Most SCTs reach focus. If you run out of counter-clockwise turns when trying to focus in reduction mode, we
can pro ide solutions. We are currently designing a special SCT right angle prism diagonal that has the shortest
possible light path and will reduce the back focus requirements so that focus in reduction mode will not be a
problem. It will be a ailable soon. We also ha e other solutions a ailable at this time. Call for more information.
Images are not as sharp as hoped
All SCT Owners should become ery familiar with collimating the secondary mirror of their telescope. This is a
must of the best optical images are to be obtained with both single eyepieces as well as the BINOTRON-27. It is
recommended that one collimate the secondary mirror with the BINOTRON-27. A star can be centered and
iewed with both eyes, and the secondary mirror can be collimated in the same way as when using a single
eyepiece. The iews will be ery sharp if care is taken to do this.

14
Optional Accessories
OCS-A45
The OCS Cell shipped with all BINOTRON-27
Super Systems has a clear aperture of 37mm.
Pictured at right is the new OCS-A45. This optic has
a clear aperture of 45mm, the largest we could make
in a 2" format. It can better handle the outer rays of
a con erging beam produced by a telescope mirror
and this means better illumination. We recommend
it for any telescope faster than F/5 and we also
belie e that the benefit of using this may be
obser able in slower telescopes. Super Optical
Quality, Fully Multi-Coated of course! Each lens is
tested in our NY Facility before being passed.
Denkmeier Eyepieces
Our Denkmeier Eyepieces are world renowned and for good reason - The glass used is high index, the coatings
are the best, and the performance is exquisite. No, the D21s and D14s are not inexpensi e. But remember that
any pair of eyepieces used in the BINOTRON-27 Super System becomes three pairs! This is because they
operate at three magnifications. When gi en the choice of using an a erage eyepiece pair, or a fantastic pair,
consider that the pair used
essentially triples in operation.
A ailable in 21mm and 14mm focal
length, they sport 65 degrees of
AFOV and pro ide amazing
performance on planets, The Moon,
and deepsky objects.
Our D21s and D14s are as light as
we can possibly make them. The
barrels are anodized aluminum, not
chrome plated brass in order to
reduce weight. Consider adding a
pair of our D21s, D14s, or both to
your BINOTRON-27
Eyepiece Specifications
Weight
D21 8oz D14 9oz
Eye Relief 20mm
AFOV 65 Degrees
Color Corrected: Yes
High Index Glass: Yes
All Lenses Fully Multi-Coated: Yes
Matched and Tested: Yes
Rotating Batwing Eyeguards: Yes
D21: 6 Elements, 4 Groups
D14: 6 Elements, 5 Groups D21 Eyepieces in BINOTRON-27 Equipped With Optional Filter Switch

15
The Filter Switch
Using filters in your telescope can greatly enhance the isibility of many deepsky objects. Being able to mo e
filters in and out of the light path quickly is a great thing! That is precisely what our Denkmeier Filter Switch
allows you to do. So, why not add our Filter Switch System to your BIONTRON-27 Super System.
In addition to changing
magnifications with the Super
System Power x Switch, you can
also mo e filters in and out of the
iew at will, without e er ha ing
to pull your two eyes away from
your BINOTRON-27. At
Denkmeier Optical, we pride
oursel es on the quality of our
machining. The Filter Slides mo e
in out of the light path with a
buttery smooth feel. There are
three possible Filter Switch
positions; No Filter, Right Filter,
and Left Filter. You can easily slip
each carrier loaded with a filter
out of the Filter Switch Body
without tools, then load other
filters in seconds. It is suggested
that you equip e ery filter that you own with a carrier so it is ready to be loaded into the Filter Switch Module.
We e en make 1.25" Step Down carriers that will carry our optional planetary filter or most other 1.25" filters.
While the Filter Switch can be added later, it is best to add this option at the time that you purchase your
BINOTRON-27 Super System to a oid extra cost. The Filter Switch option is reasonably priced, and a great
addition! Our carriers accept irtually all brands of filters though we do recommend that you consider our Denk
Hi-Def Filters if you do not already own filters.
Denk Hi-Def Filters
Did you know that we make our own filters? Using our on-site
Ion Beam Sputtering Technology (IBS) , we produce our own
brand of world class Nebula and Planetary filters.
Our OIII Filter performs exceptionally on emission Nebulae,
Planetary Nebulae, and many super No a remnants like The
Veil Nebula, and is a ailable in 1.25" or 2" format. With a wider
bandpass than the OIII, our UHC Filter allows the H-b line to
transmit and performs better on some deepsky objects than the
OIII. One of the abo e does not make the other obsolete though.
We do suggest reading up on filter use. There is a lot of
information out there that is useful to know and some objects
are seen better with the OIII while others better lend themsel es
to UHC use. Our Dual Band Planetary Filter will bring out
features on planet discs that may otherwise be difficult to
obser e. Please isit our website and read about our filters.
They make an excellent addition to the Filter Switch Option if
you do not already own filters.

16
arranty Information
We will fix or replace your BINOTRON-27 Super System or any additional optional accessory purchased from
Denkmeier Optical, Inc. or an authorized Denkmeier Dealer for a period of one year after deli ery. This warranty
co ers any failure of the system or optics due to faulty manufacturing or damage incurred during normal use due
to parts failure. While we are always willing to repair systems due to accidental dropping or other circumstances
beyond our control, this type of damage is not co ered under the warranty. Shipping charges may also apply.
This warranty does not co er any product that was purchased second hand whether through a dealer or a pri ate
party. This warranty co ers the original purchaser only. It is strongly recommended that you retain your original
receipt as a record of purchase.
Contact Information
We can be reached toll-free at 866-340-4578. This may not work outside of the
USA. We can also be reached by dialing 410-208-6014. If dialing from outside
of the USA, our country code is 01.
Email us at [e-mail]
Denkmeier Optical Headquarters are located in Hauppauge, NY.
Our Shipping Address:
Denkmeier Optical/Spectrum Thin Films
135 Marcus Bl d SpectrumThin Films Coating Lab Area
Hauppauge, NY 11788
Denkmeier Optical Workers Tony Pirera (L), and Russ Lederman (R) Ted H. (Our NEAF Helper) at NEAF, 2012
Denkmeier Optical, Inc. Headquarters are located in Hauppauge, NY. We joined forces with Spectrum Thin
Films 4 years ago, making the mo e to their headquarters on Long Island in New York. Originally, Spectrum
Thin Films coated our optics before we decided to team up. Denkmeier Optical, Inc. is co-owned by Anthony
Pirera and Denkmeier Optical Founder Russ Lederman, in entor of the Optical Corrector System, Power x
Switch, and Power Switch Star Diagonals. Our workers are experienced in handling optics of all kinds under
clean room conditions. Various types of optical coatings are done on premises for professional obser atories,
NASA, and other clients. The benefit of teaming up with Spectrum Thin Films has enabled Denkmeier Optical to
inno ate and bring new products to the marketplace. The future looks ery bright. Keep looking for new
products in the next few years!
Copyright, 2013 Denkmeier Optical, Inc. All rights reser ed. Reproduction without written permission from Denkmeier Optical, Inc. is Prohibited.