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 fine astronomical instrument. The includ-
ed 18mm eyepieces provide 31x magnification, but optional 1.25"
interchangeable eyepieces (available from Orion) let you vary the
magnification for deep-sky, wide-field solar system, and terrestri-
al viewing - with 3D-like depth of field! 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 magnification 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 magnification of 31x, but other mag-
nifications 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, first 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 filters,
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
