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ERGONOMICS—If you will be viewing for a long period of time,
a lighter product will be more comfortable. Also, where you
wish to carry your device will make a difference when deciding
on what size to purchase.
PRACTICALITY—If you will be using your system on camping
trips and other places where electricity is unavailable, make
sure the battery corresponding to that system is easily available
for purchase.
PRICE—Famous Trails specializes in creating affordable prod-
ucts for their users, but prices can range from $199 to $10,000.
Think about how often and in what way you will be using your
product and thus how much you want to spend. A scope or
monocular for $2,500 would be a fantastic piece of equipment
to own, but you could also purchase a high definition system
that will satisfy all your needs for under $500.
A Glossary of Night Vision Terms
ANGLE OF VIEW—the angle (in degrees) of your field of view
when looking through a device.
BINOCULAR—a device that contains two connected sets of
image intensifiers and optics that share a power source.
BLACK SPOTS—black spots on an image possibly caused by
foreign substances on the surface of the lenses or marks within
the image intensifier.
BLOOMING—a situation where a part of the projection has been
overloaded with too much light.
BRIGHT-SOURCE or OVER-LIGHT PROTECTION—a circuit that will
decrease or shut off power to a product when over-lighting
occurs, protecting the image intensifier. (Over-exposure to bright
light sources can decrease the life of your image intensifier)
Normal viewing will resume within one to two minutes.
DIOPTER—a measurement unit for the refractive power of a
lens, either for a device or for the human eye.