Glossary of Terms at The Binocular Site

	Glossary of Terms Aperture - Refers to the diameter of the objective lens in millimeters. Aperture is the second number in the 8x42 formula on binoculars. Binocular - an optic tool that blends an image seen by both eyes into a single image. Binoculars are available in different powers or magnifications. Digital Binocular - a binocular and digital camera combined. Eyepiece - the lens at the viewing end of a telescope. The eyepiece enlarges an image captured by the telescope. Eye Relief - A function for eyeglass wearers that allows your eyes to be at a greater distance from the eyepiece. Field of View - The size of the "window" you see through when looking through binoculars. Giant Binoculars - Binoculars for astronomy, with apertures of 70mm, 80mm, 100mm or greater. Image Intensification - Night vision technology that collects light energy from its surroundings. Liquid Crystal Display (LCD) - A display technology common in digital cameras that increases visibility and reduces eyestrain. Magnification - Increases the apparent size of an object. Magnification is the first number in the 8x42 formula on binoculars. Monocular - mini scopes such as spyglasses and pen scopes that allow a magnified view of an image seen from one eye. Night Vision - improves visual capabilities during nighttime, or in low light surroundings. Used commonly by the military, aviators and by law enforcement for surveillance. Night vision is also a useful tool for nocturnal hunters, hikers and birders. Opera Glasses - pocket-sized, and usually decorative compact binoculars for theater-goers. Phosphor - A coating that emits light when excited by energy. The screen on night vision equipment is green phosphor. Rangefinders - an optical measuring instrument that finds the distance of an object. Useful tools for golfers, mariners, hunters and for target practice. Riflescopes - sights for hunting that mount onto a rifle and make targets appear closer then they actually are. Spotting Scopes - a telescope that is primarily intended for land viewing, as opposed to astronomical. Telescope -intensely magnifies distant objects for celestial exploring. Telescopes come in Refractor and Reflector models. Thermal Imaging - Night vision technology that captures light from heat emissions.

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