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Waterproof Binoculars
The BT100 is nitrogen-purged and sealed to be waterproof
and internally fogproof. 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 completely 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!
Cleaning and Care of Binocular Lenses
The lens surfaces of Orion binoculars are coated with anti-
reflection multi-coatings that can be damaged with careless
handling. Avoid touching lens surfaces with fingers 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
fluid that are specifically designed for multicoated lenses. Do
not use fluids 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, first 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 cleaning fluid on a fresh piece of lens cleaning tissue
(never on the lens) and gently wipe the lens. Quickly wipe the
excess fluid 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 heavy-duty case for safe
storage and transport. We recommend always keeping the bin-
oculars in their case with the cover caps on when not in use.
The case has a lock on each latch for extra security. Use one
of the supplied keys to lock and unlock the latches. A remov-
able shoulder strap is also provided for ease of transport.
Avoid unnecessary shocks to the binocular, whether it is in its
case or not. Although the BT100 is designed to be mechani-
cally rugged, excessive impacts may cause the optics to
become misaligned. This is not covered by the warranty.
A metal carry handle is supplied with the BT100. This con-
nects to the dovetail holder on the binoculars, which is located
just in front of the eyepieces (Figure 1). Slide the handle’s
base into the dovetail holder, and secure it in place with the
thumbscrew. The handle comes in quite handy when attempt-
ing to mount the BT100 onto a tripod. Before the BT100 can
be placed into its case, the handle must be removed.
Allow the optics to slowly adjust to cold weather by storing the
instrument (in its case) 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, open up
the case, remove the binoculars, remove the cover caps, and
let everything dry out. 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
Focal length: 609mm
Magnification: 24x Sirius eyepieces included,
uses standard 1.25" eyepieces
Focusing: Individual focus eyepieces
Field of view: 2.2° for the included eyepieces
Eye relief: 16.9mm for the included eyepieces
Close focus: 50 feet
Prisms: BAK-4, porro, provide 90° viewing
angle
Anti-reflection coatings: Fully multi-coated
Eyeguards: Fold-down, rubber
Body design: All metal construction, single-piece
body design, waterproof
Interior: Glare threaded, baffled, and
blackened
Lens shades: Retractable
Weight: 14 lbs. 75 oz.
Mounting provision: ¼"-20 mounting plate
Carry handle: Included, metal, removable
Dust covers: Rubber covers for objective lenses,
rubber caps for eyepieces and
eyepiece holders
Case: Custom foam-lined hard carry
case included, removable shoulder
strap, 2x lock latches with keys
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