Orion GiantView BT100 User manual

Orion®GiantView™BT100
#51849
INSTRUCTION MANUAL
Congratulations on your purchase of a pair of quality Orion bin-
oculars. The GiantView BT100 provides the large light grasp you
need for astronomical observation, but unlike a telescope, allows
you to use both eyes simultaneously for viewing. This results in bet-
ter image resolution, contrast, and brightness than a similar sized
telescope can provide.
The BT100 is a true binocular telescope, with optical quality and
features you'd expect of a ne astronomical instrument. The includ-
ed 18mm eyepieces provide 31x magnication, but optional 1.25"
interchangeable eyepieces (available from Orion) let you vary the
magnication for deep-sky, wide-eld solar system, and terrestri-
al viewing - with 3D-like depth of eld! The 45° eyepiece viewing
angle provides a great compromise between daytime spotting and
nighttime observing, as the binoculars don’t need to be positioned
above your head when looking upwards. The rugged body con-
struction and waterproof design ensure the BT100’s will provide
viewing enjoyment for years to come.
Please take the time to read this instruction sheet before using
your new binoculars.
Using a Tripod
When observing with large-aperture binoculars like the Orion
BT100s, a sturdy photo tripod or altazimuth mount is required. This
is because the weight and magnication of the binoculars make it
impossible to hold them steady with your hands.
To attach the BT100 to a photo tripod, simply thread the tripod’s
¼"-20 mounting stud into the threaded hole on the underside of the
BT100’s mounting plate. The tripod must be able to support approxi-
mately 15 lbs., otherwise it may not be stable enough for the BT100.
Consult your tripod manual or spec sheet for the weight capacity.
To attach the BT100 to an altazimuth mount that utilizes a dove-
tail holder, like the Orion VersaGo II or Monster Parallelogram
mount, a dovetail L-bracket is needed. The L-bracket connects
to the BT100’s mounting plate, and has a dovetail bar that goes
directly into the mount’s dovetail holder. Contact Orion to order this
L-bracket if needed.
Inserting the Eyepieces
Perhaps the most unique feature of the BT100 is its ability to uti-
lize standard 1.25" eyepieces. The two supplied Ultra Flat Field
18mm eyepieces provide a magnication of 31x, but other mag-
nications can be obtained by purchasing optional eyepieces from
Orion. Most standard 1.25" eyepieces will work with the BT-100, as
long as the eyepieces are capable of seating fully into the eyepiece
holders.
To install the eyepieces, rst remove the cover caps from the binoc-
ulars and eyepieces. Loosen the knurled locking ring Figure 1) to
allow the eyepieces to be inserted. Then, simply insert the eyepiec-
es into the binoculars’ eyepiece holders. Push the eyepieces into
the holders until they are fully seated. Twist the knurled locking
ring clockwise to lock the eyepieces into place. To remove the eye-
pieces, simply loosen the locking ring and pull the eyepieces out of
their holders.
IN 603 10/17
WARNING Never look directly at the Sun through your
binoculars without professionally made solar lters,
even for an instant, or permanent eye damage could
result. Young children should use these binoculars on
sunny days only with adult supervision.
Retractable lens shade
Retractable lens shade
Interoccular adjustment
housing
Knurled locking ring
Knurled locking ring
Eyepieces Handle

2
Extending the Lens Shades
Another nice feature of the BT100 is its extendable lens shades
(Figure 1). These increase image contrast by preventing glare
(unwanted stray light) from entering the objective lenses of the bin-
oculars. They also slow the formation of dew on the objective lens
exteriors.
To use the lens shades, grasp them with your ngers, and pull them
outwards. You will need to retract the lens shades to t the binocu-
lars into its box.
Adjusting the Distance Between Your Eyes
(Interoccular Distance)
Adjusting the interoccular distance of the BT100 is incredibly easy.
Simply grasp the base sections below each eyepiece focuser hous-
ing (Figure 1) and rotate inwards or outwards with your thumbs.
The two housings are connected internally, so they rotate with
each other, always insuring the eyepieces stay level and aligned.
Pivot the bases while looking through the BT-100 until the distance
between the eyepieces matches the distance between your eyes.
When properly adjusted, you should see a single, round eld of
view when looking through the binoculars. Make this adjustment
before you attempt to focus the binoculars.
Focusing
The BT100 binoculars utilize individual focus eyepieces. This
makes the binoculars mechanically more rugged than similar cen-
ter-focus models, and generally maintains optical alignment better.
For astronomical observation, individual focus eyepieces are usu-
ally preferred.
Pick an object in the distance to view. At night, best focus will be
achieved by focusing on a medium bright star. Cover your right eye
(or cover the right objective lens of the binocular) and focus the left
eyepiece by rotating the rubber grip ring on the eyepiece holder
until the image appears sharp. Then cover your left eye (or cover
the left objective lens of the binocular) and focus the right eyepiece
by rotating the eyepiece holder until the image appears sharp. The
binoculars are now focused. If you want to view an object at a dif-
ferent distance, re-focusing of both eyepieces is required. Also,
changing eyepieces may require refocusing.
For astronomical observation, all objects will always appear focused
at the innity focus point. This means you only need to focus the
binoculars once per observing session per set of eyepieces. Since
everyone’s eyes focus images slightly differently, different observ-
ers will need to refocus the binoculars for their own vision.
Waterproof Binoculars
The BT100 is sealed to be waterproof. While it is impervious to
rain, wind, splashing, and humidity, do not immerse the binocular in
water under any circumstances. If the binocular becomes wet with
fresh water, merely blot it dry with a clean cloth and clean the lens
surfaces as outlined below. Saltwater should be rinsed off com-
pletely and the binocular then blotted dry and its lenses cleaned
as outlined below. If the binocular body becomes dirty, it can be
cleaned with warm water and a clean cloth. If extremely dirty, or
oily, clean the body with a dilute solution of warm water and mild
soap on a cloth, then rinse with clean water and blot dry. Do not
clean lens surfaces with soap and water! The BT100 is also not
meant to be left outside on a permanent basis, even though it is
waterproof. Exposure to the elements (especially UV sunlight, and
poor weather) will degrade the unit over time. Please bring the
BT-100 inside when you are nished with your observing session.
Cleaning and Care of Binocular Lenses
The lens surfaces of Orion binoculars are coated with anti-reec-
tion multi-coatings that can be damaged with careless handling.
Avoid touching lens surfaces with ngers or any coarse material.
All optics, even if stored, should be cleaned at least once a year
or whenever they are dirty. The dust that builds up on coatings
promotes mold growth, which etches glass and destroys coatings.
Avoid over-cleaning; it can also damage the coatings. Always use
lens cleaning tissue and uid that are specically designed for mul-
ticoated lenses. Do not use uids or tissues that are for eyeglasses
or household use. Never attempt to disassemble the binocular or
eyepieces in order to clean them; this can also void the warranty.
To clean the binocular (and eyepiece) lenses, rst blow off the
lens with a blower bulb or gently wipe the lens with a lens cleaning
brush to remove the larger particles. Put a few drops of lens clean-
ing uid on a fresh piece of lens cleaning tissue (never on the lens)
and gently wipe the lens. Quickly wipe the excess uid with a new,
dry piece of lens cleaning tissue. For larger lenses, clean only a
small area at a time, using a new tissue each time. On excessively
dirty lenses, wipe across the lens using one stroke for each tissue,
alternating wet and dry.Always avoid excessive pressure or rubbing
when wiping, as wiping too hard can scratch the lens.
Storage and Transport
The BT100 binoculars come with a foam lined transport box for
safe storage and transport. We recommend always keeping the
binoculars in this box with the cover caps on when not in use.
Avoid unnecessary shocks to the binocular, whether it is in its box
or not. Although the BT100 is designed to be mechanically rugged,
excessive impacts may cause the optics to become misaligned.
This is not covered by the warranty.
Allow the optics to slowly adjust to cold weather by storing the
instrument in a cold area, such as an unheated garage or the trunk
of a car, for a few hours before use. When bringing the instrument
back inside a warm house, let everything dry out before placing the
caps on the objectives or storing it in the box. If there is moisture
on the objective lenses when the caps are attached, the moisture
will not evaporate, and can end up etching the coatings over a long
period of time. The binoculars should be stored in a cool, dry place
to prevent mold growth, which can damage the optics. This is also
not covered by the warranty.
Specifications
Objective lenses: 100mm clear aperture, air-spaced
achromatic doublets
Magnication: 18mm Ultra Flat Field eyepieces
included (31x), uses standard 1.25"
eyepieces
Focusing: Individual focus eyepieces
Field of view: 2.1° with the included eyepieces
Prisms: BAK-4, porro, provide 45° viewing
angle
Anti-reection coatings: Fully multi-coated
Body design: All metal construction, waterproof
Interior: Glare threaded, baffled, and
blackened
Lens shades: Retractable
Weight: 14.5 lbs.
Mounting provisio: ¼"-20 mounting plate
Carry handle: Included, metal
Dust covers: Thread on covers for objective lenses,
rubber caps for eyepieces and
eyepiece holders

3
One-Year Limited Warranty
This Orion product is warranted against defects in materials or workmanship for a period of one year from the date of purchase.
This warranty is for the benet of the original retail purchaser only. During this warranty period Orion Telescopes & Binoculars
will repair or replace, at Orion’s option, any warranted instrument that proves to be defective, provided it is returned postage paid.
Proof of purchase (such as a copy of the original receipt) is required. This warranty is only valid in the country of purchase.
This warranty does not apply if, in Orion’s judgment, the instrument has been abused, mishandled, or modied, nor does it apply
to normal wear and tear. This warranty gives you specic legal rights. It is not intended to remove or restrict your other legal rights
under applicable local consumer law; your state or national statutory consumer rights governing the sale of consumer goods
remain fully applicable.
For further warranty information, please visit www.OrionTelescopes.com/warranty.
Orion®Telescopes & Binoculars
Corporate Offices: 89 Hangar Way, Watsonville CA 95076 - USA
Customer Support: www.OrionTelescopes.com/contactus
Copyright © 2017 Orion Telescopes & Binoculars
All Rights Reserved. No part of this product instruction or any of its contents may be reproduced, copied, modified or adapted, without the prior
written consent of Orion Telescopes & Binoculars.