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Lasers were once the stuff of science fiction, but today it is possible to build a laser that, while functioning on a much lesser scale, works exactly like the one NASA used to bounce a beam off...
A laser pointer uses a small lens to focus the laser light as it exits the barrel of the pointer. A dirty or cracked lens inhibits the laser light and renders the laser pointer useless. Replacing...
The first cameras allowed people to take limited views of the local landscape. The panoramic camera, with lenses that can rotate from 110 to 360 degrees, solved this problem in the 19th century....
Whether you are a kid trying to set leaves on fire with the sun or a person looking for clues, you have most likely encountered a magnifying glass in some shape or form. In the modern world, it's...
A laser pen is composed of a laser diode, a battery, and possibly a lens. Many laser pointers are red or green lasers, depending on the quality. Red lasers are less powerful than green lasers in...
The main component of an overhead projector is the base. This base contains a clear glass top with an interior light. A small fan on the back of the unit removes heat that is produced by the...
A slide projector uses a light source to shine light through a photographic slide and focus the image through lenses to project it onto a wall or screen. It uses the same principle as a movie...
The lens is one of the most important parts of your camera, so you need to keep it clean. Dirt and dust on your lens can produce a poor-quality photo, so proper care and storage is important, as...
You're on an Audubon chapter outing to nab some new birds, and your viewfinder captures a thumb print. Perhaps you're at a desert star party for some astronomical imaging, and sand has marred your...
Telescope eyepieces form the magnified images that you see when you look through the telescope's optical tube. An eyepiece consists of lens components in a moisture- and dust-resistant housing....
Birders, hunters and other outdoor enthusiasts who want to check out the terrain consider their binoculars a necessity. Nature watchers rely on them for quick species identification. Rafters or...
The world of high-tech optics is continually evolving, and along with new, feature-rich cameras, binoculars, telescopes and other optics come some interesting accessories. Enhance the quality of...
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