Takahashi E-160ED User manual
Instruction Manual
TAKAHASHI
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Thank you for purchasing the ε-160ED hyperbolic astrograph.
While on paper the specications of the ε-160ED look very similar
to the older ε-160, the optical performance is completely dierent.
Through improved design and exciting manufacturing precision,
the correction of aberrations has allowed Takahashi to achieve
a diffraction limited spot size of 3 microns over a 44mm image
circle. This helps make the ε-160ED the ultimate telescope for
astrophotography.
Please read this instruction manual thoroughly prior to use. This
will help you get the most out of your telescope. All products are
shipped only after a thorough inspection, but if you nd any defects,
please notify your Takahashi distributor immediately.
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WARNING
CAUTION
Never look at the sun with an astronomical
telescope. The intense light and heat
present on the optical surfaces and at the
focal point can damage the telescope and
may result in a re.
Looking at the sun through a telescope will
cause instant and permanent blindness.
When mounting the telescope on an equatorial mount be careful
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not to drop the telescope or pinch your fingers or other body
parts. Injury may result.
When setting the telescope down, be careful not to set the
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telescope on an unstable surface. The telescope could fall,
resulting in damage to the telescope or bodily injury.
Do not place the product in direct sunlight. Accidentally pointing
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the telescope at the sun can result in intense heat at the focal
point and possible re.
Be careful not to pinch ngers when using the focuser.
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The telescope contains small parts that can be harmful if
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swallowed. Do not allow small children to be around the
telescope unsupervised.
The packaging contains flammable materials. Keep away from
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heat or re. Do not allow children to play with the plastic shipping
bag. Suocation could result.
DANGER
Warning & Caution
Please be mindful of the following safety precautions.
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Table of Contents
Warning & Caution ------------------------------------------ 3
Table of Contents ------------------------------------------- 4
Specications ------------------------------------------------ 5
Tube Assembly Layout ------------------------------------ 6
About the Optical System --------------------------------- 7
Setup ----------------------------------------------------------- 8
Observation ------------------------------------------------ 15
Accessories ------------------------------------------------ 17
Optical Alignment ----------------------------------------- 18
Precautions for Photography --------------------------- 26
Care & Maintenance ------------------------------------- 27
System Charts --------------------------------------------- 29
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Specications
Optical System ------------------------- Hyperboloidal Catadioptric
Eective Diameter --------------------- 160mm
Eective Focal Length ---------------- 530mm
Eective Focal Ratio ------------------ 1:3.3
Secondary Mirror Diameter ---------- 63mm
Corrector Lens -------------------------- 2 elements in 2 groups
Image Circle ----------------------------- φ44mm
Photographic Field --------------------- 4.8 degrees
Metal Back ------------------------------- 56.2mm
Diameter of Main Tube --------------- 204mm
Length of Main Tube Assembly ----- 580mm
Weight of Main Tube Assembly ----- approximately 6.9kg
Finder Scope ---------------------------- optional accessory
Focusing System ----------------------- Rack & Pinion (MEF-3 compatible)
Included -------------------------- Instruction Manual, Warranty Card,
3 Screws for primary mirror Installation,
Hex Wrench (2mm, 2.5mm, 3mm, 4mm)
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Tube Assembly Layout
Bottom Ring
Oblique Mirror Optical
Axis Push Screw
Oblique Mirror
Optical Nut
Primary Mirror Back Cover
Set Screw x 3
Primary Mirror
Bottom Retainer x 3
Primary Mirror Optical Axis
Adjustment Screw x 3
Oblique Mirror
Spider
Cross Head
Screw x 3
Rotator Lock
Primary Mirror Cell
Adjustment Screw
Focus Lock
Focuser
Draw Tube
ε-160ED Corrector
ε-130D Visual Adapter
Coupling (S)
31.7 mm Eyepiece Adapter
Adapter Cap
Focuser Knob
Main Tube
Finder Base
Focuser Base
Top Ring
Cap
Primary Mirror
Primary Mirror Cell
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The revolutionary Epsilon optical system uses a hyperbolic surface for the primary mirror,
coupled with a corrector in the focuser body. By combining a concave mirror and a convex
lens reducer system, the Petzval condition is achieved, resulting in a attened image plane.
Takahashi’s unique Epsilon optical system corrects the spherical aberrations and coma for
outstanding image quality.
About the Optical System
Epsilon Performance
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The Epsilon ε-160ED is a new product
that further evolves Takahashi’s unique
Epsilon optical system. The newly designed
double-lens correction lens is a new type
that pursues the aberration correction
required for modern imaging sensors, and
a diffraction-limited spot image is achieved
with a star image of 3 microns out to the
edge of a full frame sensor. The smallest
star image is about 1/10 the size of the older
ε-160. In addition, the distortion aberration
(distortion), which was a drawback of the
old correction lens, has been corrected to
less than half, which makes image mosaics
easier to compose. The ε-160ED’s 530mm
(f/3.3) specification, which has the highest
level of optical performance, combined with
the lightweight and compact body, make
it an astrophotography instrument that
allows you to enjoy the very best in Epsilon
performance.
Takahashi Mirrors
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Although it is generally considered very
dicult to polish hyperbolic primary mirrors,
Takahashi has developed this technology
and evolved the production into this modern
style.
Diagonal Oset
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In order to achieve maximum illumination,
the secondary must be offset from the
center of the optical axis to produce the best
possible illumination for the image. As the
speed of the optical system increases, so
does the offset. The oversized secondary
has been offset to produce the maximum
illumination for the image.
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Balancing
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Attach any additional equipment, such as
camera and adapters, to the optical tube
assembly before balancing. It is best to
have the focuser pointing skyward when
balancing. Proper balance is important
to avoid damage to the telescope and to
reduce the strain on the mount gears and
motors when slewing and tracking.
Balance around the Declination Axis▼
Loosen the R.A. clamp and rotate the 1.
tube so that it is in the horizonal position.
If the R.A. balance is too far off, the
telescope may be dicult to move. In this
case, balance the R.A. axis rst.
While holding the telescope rmly, loosen 2.
the declination clamp slightly and check
the balance around the declination axis.
If the balance is not correct, loosen 3.
the tube ring locking nuts and slide the
telescope back and forth within the tube
rings until proper balance is achieved.
Once balance is achieved, tighten the
tube ring locking nuts.
Attaching the Tube holder
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(Tube holder and Plate are sold separately)
Attaching the telescope to an equatorial
mount will require the tube rings and
mounting plate. First, attach the tube rings
to the mounting, but do not tighten the
mounting bolts completely. This will provide
some play in the position of the tube rings.
Then, attach the bridge plate to the tube
rings, connecting the two tube rings on
the top. After the bridge plate is attached,
tighten the tube ring mounting bolts to
the mounting plate. Secure the mounting
plate to the Takahashi mount using the two
provide cap bolts.
With the tube rings open, carefully mount
the telescope in the tube rings. Once the
telescope is in place, close the tube rings
and secure them with the tube ring lock
nuts. With the lock nuts in place but not fully
tightened, balance the telescope on the
mount. Once proper balance is achieved,
tighten the lock nuts (Please see next
section on for more details on balancing).
(Note) The Takahashi mounting plate can
be used with the EM-11, EM-200 and EM-
400 mounts. If a third-party mount is used,
a proper mounting plate will need to be
obtained.
Setup
Cap Bolt
Washer
Tube Ring
Lock Nut
Mounting Plate
Equatorial Mount
Tube Rings
▼Balance around the R.A. Axis
With the declination axis balanced, rmly 1.
tighten the declination clamp.
Loosen the R.A. clamp and check the 2.
balance around the R.A. axis.
If the balance is not correct, move the 3.
mount balance weight up or down to
achieve proper balance.
If balance cannot be achieved with the 4.
weight at the extreme end (bottom) of the
shaft, additional weight may need to be
added.
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Focusing System
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Focuser▼
ε-160ED adopts a rack and pinion system
that allows the focusing mechanism to
achieve best focus and enables speedy
operation. To focus, loosen the focus lock
and rotate the focusing knob until focus is
achieved. Please note that if you attempt to
focus with the focus lock engaged, you may
cause damage to the focusing gear or draw
tube.
(Note)
Please also refer to the section on imaging
•
for more information on focusing.
The size of the focus lock has been
•
increased to ensure that the draw tube
does not move during imaging. Therefore,
the distance between the rotator lock and
the drawtube lock is narrow. Use caution
when using to avoid pinching injuries to
ngers.
Corrector▼
The Epsilon optical system is designed
so that a good image can be obtained
by combining the primary mirror and a
corrector lens. These are meant to work
together, and the telescope should not be
used without the corrector. However, when
adjusting the optical axis, it is difficult to
make adjustments with the corrector in
place, so the corrector should be removed
to adjust the optical axis. When reattaching
the corrector after adjusting the optical axis,
be sure that it is screwed completely in, so it
does not come loose during imaging.
(Note)
The corrector for the ε-160ED is for the
•
ε-160ED only. It cannot be used with other
models such as the older model ε-160
because the aspherical coefficient of the
primary mirror is dierent.
Camera Angle Adjuster (CAA)▼
On the ε-160ED, the camera angle
adjuster is built into the focuser, allowing
rotation of the camera, making for easy
composition adjustments. To change the
image composition, loosen the rotator lock
and rotate the camera. When the image
is composed properly, tighten the rotator
lock. When rotating the camera, be sure
to hold the focuser body when turning so
that the threads attaching the corrector and
camera mount do not loosen. The rotator is
designed so that the focus does not change
due to this rotation, but this should be
conrmed after each rotation.
Telescope OTA
Rotator Lock
Focus Lock
Focuser Body
Draw Tube
Corrector
Rack Gear
Focuser Knob
Focuser Base
Focuser Base
Corrector
Pinion Gear
Focuser Knob
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- 10 -
Visual Use
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While the ε-160ED is designed for
astrophotography, you can attach an
eyepiece and enjoy it as a wide-field
telescope for visual observation. To attach
an eyepiece, loosen the compression ring
and remove the eyepiece cap. Then insert
an eyepiece into the eyepiece adapter and
tighten the compression ring. If the eyepiece
cannot be inserted even after loosening the
compression ring, push the plastic ring
inside the compression ring with your ngers
to expand it. While all Takahashi eyepieces
have been conrmed to reach focus with the
ε-160ED, third party brands have not been
tested to conrm focus.
Eyepieces
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Takahashi sells the following types of
eyepieces. Each series is designed with
different features and capabilities so that
you can choose the eyepiece that is best for
your needs.
LE▼
LE eyepieces are high-quality eyepieces
that provide a wide field of view and a
wide variety of types from low to high
magnication. Available sizes: LE5 to LE30
in a 31.7 mm style, and LE40 and LE50 in
50.8 mm style. Note that 50.8 mm eyepieces
cannot be used with the ε-160ED.
ABBE▼
While the construction of Abbe eyepieces
has a short apparent eye-relief when
compared to more modern designs, they
provide good contrast and high performance
at a low cost. All Abbe eyepieces are a 31.7
mm style.
TOE▼
TOE eyepieces take full advantage of the
performance of the objective lens, and are
designed with priority to magnications and
eld of view suitable for observing the moon
and planets at high magnification. All TOE
eyepieces are a 31.7 mm style.
TAK-UW▼
TAK-UW are a series of ultra-wide-angle
eyepieces with an apparent eld of view of
90 degrees, while prioritizing the sharpness
of the star image. All TAK-UW eyepieces
are a 31.7 mm style.
Compression Ring
Eyepiece
Compression Ring Insert
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- 11 -
Focusing System▼
The telescope uses a rack-and-pinion
focusing system. This system permits rapid
and accurate focus adjustment. By turning the
focusing knob clockwise, the drawtube will
move out of the telescope tube. By turning
the focusing knob counter-clockwise, the
drawtube will move into the telescope tube.
Adjusting the focus point▼
Focusing is performed by moving the rack
gear attached to the Drawtube and the pinion
gear directly connected to the Focuser knob
to move the Drawtube in and out. This rack
and pinion system make it easy to adjust the
speed at which the focusing knob is turned,
and precise focus is easy to quickly achieve.
Turn the focuser knob in the direction of the
arrow in the gure to move the drawtube out,
and turn it in the opposite direction move the
drawtube in.
Focusing
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After attaching the eyepiece to the telescope, it is necessary to align it with an object in the
eld of view. Especially when looking at a star, if it is out of focus, you may not be able to see
anything even if the star is caught in the eld of view. Also, if you do not focus accurately, you
will not be able to bring out the optimum performance of the telescope. In astrophotography,
accurate focusing is the deciding factor for taking good pictures. Please try to observe with
the best possible focus, as follows.
Focusing▼
First, attach the eyepiece to the eyepiece
adapter, and check that the focus lock is
loose. Next, slowly turn the focus knob. The
telescope is shipped with the drawtube in its
fully retracted position, so when using the
telescope for the rst time, you will gradually
need to extend the draw tube to achieve
focus. Prior to observing celestial bodies,
focus on a distant terrestrial object during
the daytime (note that the landscape will
appear upside down) and mark the focus
position on the drawtube. If you perform
this with distant objects, the position of the
focuser should be close to that needed to
see a celestial body. As a guide, you can get
good focus from that position with a slight
focus adjustment. When you look at a star
at high magnification, the star image may
be greatly blurred or not visible at all if the
focus is even slightly o. First focus at low
magnification and then replace with a high
magnication eyepiece to focus. When you
switch magnication you may need to adjust
focus again.
Focus Lock▼
The Focus lock is not generally required
for visual observation, but when taking an
image, the weight of the camera attached
to the eyepiece may cause the Drawtube
to move, resulting in a change in focus. To
avoid this, tighten the Focus lock to x the
draw tube firmly in place. When moving
the Drawtube again, be sure to loosen the
Focus lock.
Forcibly turning the Focus knob
while the focus lock is tightened may damage
the gear or cause play in the focuser.
Focus Lock
Rotating in this direction moves
the draw tube outward
Focuser Knob
Drawtube
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Mounting the Finder Scope
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The ε-160ED can be used with the
Takahashi 6x30 or 7x50 finder scope and
nder scope bracket (sold separately).
Place the finder bracket in on the finder
pedestal as shown in the figure below.
Securely fix the Finder bracket to the
Finder base with the cap bolts and washers
included with the Finder bracket. Use the
included Hex Wrench (4 mm) to tighten the
bolts. If you install and tighten these bolts
without attaching the Finder bracket, they
will come into contact with the telescope
tube and may cause damage.
6 x 30 Finder scope▼
Insert the 6x30 mm Finder scope into the
Finder bracket as shown in the upper right
figure and adjust the position so that the
Finder scope centering screw presses the
groove on the Finder scope. Adjust the
Finder scope adjustment screw and the
Finder scope centering screw so that the
gap between the inner circumference of the
Finder bracket and the Finder scope itself is
even, and x with the Lock nuts.
Hex Wrench (4mm)
Washer
Finder Bracket Hex Cap Bolt
Groove
6x30 Finder Scope
Finder scope centering screw
Lock Nut
Finder Bracket
Finder Base
Attaching the Finder Scope▼
(requires a athead screwdriver)
If the Finder scope adjustment screws
and the end of the Finder scope centering
screws are too far inside the Finder
bracket, they will hinder the insertion of the
Finder scope. To back out the centering
screws, back o the Lock nut of the Finder
scope adjustment screw and back out the
adjustment screw. To back out the Finder
scope centering screws, use a flathead
screwdriver to back out the screws.
(Note)
To prevent small scratches on the Finder
scope, you may wish to use clear tape (3
layers) to protect the Finder scope where it
meets the Finder bracket screws.
Finder Base
Finder Scope Adjusting Screw
Caution
Never use the Finder scope and Finder
bracket as a handle to lift the ε-160ED.
This can damage the Finder bracket
and the Optical tube assembly, creating
alignment problems.
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Finder Scope Centering Screw
Finder Scope Adjusting Screw
Finder Scope Finder Eyepiece
Focus Lock Ring
Lock Nut
Finder Bracket
Adjusting the Finder Scope
ی
Since the telescope has a high magnication
and relatively narrow field of view, locating
and centering celestial bodies can be
dicult. Also, when taking an image of a star
with a camera, the image can be very dark,
further complicating the proper centering of
the object.
To help with centering objects, the finder
scope is used. The finder scope is a small
telescope with a low magnification and
a wide field of view. If the finder scope is
properly aligned with the telescope, objects
centered in the finder scope will be in the
field of view of the telescope. To properly
align the nder with the telescope, use the
following procedures.
Focus Adjustment of the Finder▼
Loosen the focus lock ring. 1.
Using the finder, while viewing a distant 2.
object on land, rotate the nder eyepiece
until sharp focus is achieved.
Tighten the focus lock ring.3.
Crosshair
Telescope Field of View
Finder Field of View
a
b
c
Adjusting the Finder Alignment▼
Set up the telescope for visual use 1.
according to the system chart and attach
a lower power eyepiece. Then, select a
clearly visible distant object and center
it in the field of view. This is most easily
done during the daytime.
Exchange the lower power eyepiece for a 2.
higher power eyepiece, and again focus
on the distant object.
Looking through the finder, move the 3.
finder with the following procedure and
adjust it so the object is centered in on
the crosshair.
To adjust the finder, turn all lock nuts 4.
until they reach the head of the adjusting
screws.
Referring to the diagram, in order to 5.
move the crosshair in the direction of the
arrow, first loosen screw (a) and tighten
(push) the finder with screw (c). Next
loosen screw (b) and tighten the finder
with screw (c). This procedure will move
the crosshair in the desired direction. The
end of the nder will move in the opposite
direction and the object will move in the
direction of the small arrow. When the
finder is properly aligned, lock the finder
by tightening the lock nuts.
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Cap Screw
7x50 Finder Scope
Reticle Illuminato
r
Reticle Illuminator
ی
The Reticle Illuminator (sold separately) can
be attached to the 7x50 Finder scope. With
the reticle illuminator, the crosshairs of the
nder scope are illuminated in red, making it
easy to center celestial bodies.
When the illuminator is not attached to the
finder, a screw is attached at the position
where the illuminator is attached. To install
the reticle illuminator, rst remove the screw
with a flathead screwdriver. Then, screw
the reticle illuminator into the nder scope.
Turn the knurled knob on the end of the
illuminator to activate and adjust the light
intensity. When turned, the knob will make
a clicking sound to indicate is in the on
position. If you continue to turn the knob in
the same direction, the light intensity will
increase. If you turn the knob in the opposite
direction, the light intensity will decrease
until the light turns o with a clicking sound.
Adjust the brightness of the light so that
you can easily see both the stars and the
crosshairs while looking through the finder
scope.
Replacing the Battery▼
When replacing the batter, remove the
battery case as shown in the figure. Wipe
the terminal surface of the new battery
thoroughly and install the battery. Use care
not to make a mistake in the polarity. The
battery uses a button battery (LR44).
7 x 50 Finder scope▼
Insert the 7x50 Finder scope into the Finder
bracket, as shown in the figure below.
Evenly tighten the 3 Finder centering screws
at appropriate positions with a flathead
screwdriver. Adjust the nder screws so that
the gap between the inner circumference of
the bracket and the Finder scope is even.
Then, tighten the Finder scope adjustment
screws evenly and lock them with the
locking nut. Finally, position the Finder
Scope and the Optical Tube Assembly
(telescope) as parallel as possible. Adjust
as necessary to complete alignment.
The 7x50 Finder scope can be equipped
with an optional lighting unit called a Reticle
Illuminator (sold separately). With the reticle
illuminator, the crosshairs in the finder will
appear red, even in a dark starlit sky. This
optional accessory is very convenient to
center dark celestial bodies, etc.
Finder Scope Centering Screw
Finder Base
Finder Scope Adjusting Screw
To install, turn the base
of the reticle illuminator
to the right.
To remove, turn the battery case
as indicated by the arrow.
7x50 Finder Scope
Lock Nut
7x50 Finder Bracket
Brighter/ON
Knob
Darker/OFF
Button Battery
(LR44)
Battery Case
* The 6x30 nder scope cannot be
tted with a reticle illuminator.
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Observation
Preparations Before Observation
ی
The ε-160ED has a mirror diameter of 160
mm, and when used in low temperatures
may take some time to stabilize. Taking the
telescope outside an hour before observing
will allow it to equalize with the colder air.
Visual Applications
ی
Determining Magnication▼
This unit is designed for astrophotography.
It is not ideal for planetary observations but
can be used for deep space.
The magnication of any eyepiece used with
the telescope can be calculated by using
the following formula:
(Focal Distance of the Telescope) / (Focal
Distance of the Eyepiece)
Example: Utilizing the LE-18mm
530mm / 18mm = 29.44x
Therefore, the shorter the focal length of the
eyepiece, the higher the magnication, and
the longer the focal length, the lower the
magnication.
Please use Takahashi eyepieces. Due to the
short range of movement of the drawtube,
eyepieces from other manufacturers may
not focus. Also, with a low magnification
eyepiece with a focal length of 24 mm
or more, it will be less than the minimum
effective magnification, and the shadow of
an oblique mirror will appear in the field of
view, obstructing the view.
Astro Imaging
ی
The ε-160ED is designed as an astrophoto-
graphy telescope for deep space imaging.
Prime Focus Imaging▼
When imaging with a telescope, focusing is
one of the most critical elements of making
great images. To achieve proper focus, it
is important to place the camera sensor at
the focal point of the telescope. Because
the focal length of the telescope is large,
it is also important to use a high quality
equatorial mount. Any unwanted movement
or error in tracking can ruin an imaging
session.
To produce images using the telescope, one
can use either a digital SLR, or a specialized
CCD or CMOS camera. Takahashi system
charts show the adapters and connections
needed to attach a DSLR. Standard
adapters are generally available for Nikon,
Canon and Sony cameras. These cameras
utilize the CA-35 and a DX-WR camera ring
for the specic camera. To attach dedicated
astrophotography cameras, some
specialized adapters are needed. Please
consult with your Takahashi dealer for
further details.
Due to the specialized nature of the
ε-
160ED
optical system, image degredation can occur
when using 3rd party extenders. Therefore,
we have developed the Epsilon Extender
1.5x, which can extend the focal length by
1.5 times while maintaining the same optical
performance (release date TBD).
Camera mount DX-WR DSLR
- 16 -
Filters▼
The ε-160ED can be used with filters.
However, please note that some lters have
a large mounting frame, and not all filters
can be mounted even if the screw diameter
is the same. Also, using a lter may cause
ghosting.
A 48mm filter can be attached to the
•
camera mount DX-WR. A filter with a
large mounting frame cannot be used,
because it will cause interference when
the camera mount DX-WR is attached to
the telescope.
Camera Mount DX-WR
φ48mm Filter
M54 P=0.75
56.2mm
φ55mm Filter Correction Lens
A 55 mm filter can be attached to the
•
correction lens of the ε-160ED. A lter with
a large mounting frame cannot be used
because it will not t in the drawtube.
Back focus▼
This ε-160ED has a back focus measured
from the correction lens to the focal plane.
When specifying a camera system, it
is important that the camera sensor be
located at the focal point as defined by
the back focus. If this is not observed, the
optical performance as designed cannot be
achieved.
When using accessories, connect
according to the system chart or follow the
dimensions from the end of the correction lens.
Primary mirror
ی
The back side of the primary mirror can
be exposed so that the temperature of
the mirror can acclimate to the outside
air temperature in a shorter time, quickly
eliminating the inuence of the airow. If you
remove the three primary mirror cell back
cover set screws (▼marks),
the primary
mirror cell back cover will come off and
the back side of the primary mirror will be
exposed to the outside air.
- 17 -
Accessories
DSLR
Camera Mount DX-WR
Fine Focus Adjustment Knob
Camera mount DX-WR
ی
Use the camera mount DX-WR to attach a
DSLR camera. This mount is available in
(EOS) for Canon EF mount and (Nikon) for
Nikon F mount. If using a mirrorless Canon
or Nikon camera, an adapter will be needed
to convert the mirrorless camara to either
and EF or F mount. Contact your Takahashi
distributor for details on other cameras.
MEF-3
ی
The optional MEF-3, Micro Edge Focuser, is
an accessory (sold separately) exclusively
for Takahashi. It is designed to move the
focuser at a fine speed of 8 to 1 ratio
(smaller knob) while the larger knob moves
the focuser at 1 to 1 ratio. It can be easily
attached to the ε-160ED.
Takahashi has special accessories for imaging with the ε-160ED.
- 18 -
The ε-160ED is collimated before shipment.
Both the primary mirror and the secondary
mirror have a structure that prevents the
optical axis from shifting, but if there is a
strong impact during transportation or use,
the optics could lose collimation. In addition,
the cell may be removed for mirror cleaning,
etc., and this will require collimation of
the instrument. In shortfocus, catadioptric
systems, slight misalignment of the optics
will adversely aect the image. For optimal
imaging, it is important to keep the scope
collimated. Be sure to master the collimation
procedure so that you can always use the
scope to its fullest. Also, make it a habit to
check the collimation before use.
Collimating Tools
ی
In order to collimate the scope correctly,
prepare the following accessories and tools.
Accessories: Visual adapter (ε-130D),
Eyepiece adapter,
Connection ring (short),
31.7 Eyepiece adapter
Sold Separately: Collimating tube,
Centering eyepiece 31.7
Tools: Hex wrench, Flathead screwdriver,
Spanner (14mm)
Visual Adapter
(ε-130D)
Remove Corrector
Collimating Tube
(sold separately)
Coupling (S)
31.7 mm Eyepiece Adapter
Collimating Eyepiece
Optical Alignment
Connection
ی
First, remove the corrector. After conrming
that the camera angle adjuster is tightened,
turn the corrector body counterclockwise
until the thread fully disengages. Then
carefully pull the corrector from the
drawtube. The corrector lens is heavy, so be
careful not to drop it when removing.
Screw the Visual adapter (ε-130D) into the
focuser where the corrector was located,
and connect the other parts as shown in the
gure below.
(Note)
The collimating tube (sold separately)
comes with an instruction manual that
explains in detail how to make adjustments,
so please refer to that as well.
- 19 -
14
23
4 1
3 2
Adjusting the Secondary Mirror
ی
The secondary can be adjusted by loosening
the large nut at the center to turn it and the
three small sets of screws to tilt it.
Secondary Mirror
Optical Axis Pull Nut
Secondary Mirror Mark
Primary Mirror Mark
Secondary Mirror Mark
Four-vane Spider
Figure C-1
Figure C-2
Secondary Barrel
Optical Axis Set Screw
Using the collimating eyepiece and
collimating tube will be a great help in
collimating the ε-160ED, and are used in the
instructions below.
When collimation is necessary, complete
the process during the day in a brightly lit
room. The telescope can be pointed at a
brightly lit white wall, or at a translucent
white sheet placed across a window.
Place the tube with the focuser to the left,
facing the light source, as illustrated in the
figure. If you lose your orientation to the
movement of the secondary, place your
nger over the opening of the tube to regain
the orientation. The directions of the eld of
view correspond to the numbers 1 through 4
on the illustration.
- 20 -
Rotate the secondary mirror
Secondary Mirror Mark
Primary Mirror Mark
Figure C-3
Figure C-4
Figure C-5A
Figure C-5B
Loosen and rotate the
secondary mirror, then
lightly tighten it by hand.
Turning the mirror 1.
Loosen the large knurled nut that holds
the secondary assembly to the spider
slightly by turning it counterclockwise.
This will allow the secondary to be turned
in either direction. The secondary mirror
assembly is tightened by turning the
nut clockwise. When the securing nut is
loosened, loosen the nut very sparingly to
allow the secondary to be turned, but not
too loose.
Moving the secondary mirror 2.
Loosening the large knurled knob some
distance will allow the secondary to be
moved up or down in a parallel fashion for
better collimation.
Tilting the secondary mirror 3.
There are three screws with locking nuts
provided to allow the secondary mirror to
be tilted for collimation. In order to tilt the
secondary, it is necessary to loosen the
lock nuts. Loosen each slightly to prevent
the secondary from moving too much.
Refer to Fig. C-3.
Aligning the Secondary Mirror
ی
Turn the crosshair of the collimating 1.
eyepiece so that the lines are horizontal
and vertical. Make certain that the
telescope is pointing at the bright area.
Make certain that the telescope is pointing
at a white card or a window covered with
a translucent sheet.
If the optical axis is off, as shown in 2.
Fig. C-5A, loosen the secondary mirror
securing nut and rotate the secondary as
shown in Fig. C-4.
Rotate the secondary until the reflection 3.
of your eye is centered in the crosshair.
Slightly tighten the securing nut. Refer to
Fig. C-5B.
This manual suits for next models
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