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The lens acts as the eye of your camera, and, like the human eye, some lenses focus better than others. Some are better at seeing distances; others are better at reading fine print. Camera lenses are typically made of many individual polished glass elements. For the camera, the function is the same: to focus light rays onto a light-sensitive surface, or in this case, a digital sensor. The better the lens does the job, the sharper your picture. The simplest type of lens is a single-element convex lens, the same kind used in a magnifying glass. In profile, it is thick in the middle and tapered at the ends, as in 4-1.

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Positive lensmeaning

How a lens works is surprisingly simple. As light travels from one medium to another, it changes speed. Light travels more ...

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Note: Specifications for experimental grade optics may vary as much as 10% from those listed. Also, no additional information is available other than what is provided.

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The lens is the optical component of the camera, the part that actually absorbs and bends light. At its simplest, a lens is just a curved piece of glass; at its most complex, it involves numerous elements that are measured, ground, and arranged with subatomic precision. In either case the purpose is the same: to gather beams of light reflecting from an object and focus them to form a real image — an image that looks like the scene in front of you.

Experimental Quality Positive Meniscus Lenses are offered in several experimental grade options. Grade 1 is standard optical glass, edged, free of visible scratches, chips, stains, or oxidation. Grade 2 is unedged, non-optical glass, small chips, slight stains, or other defects. They may have slight edge cement separation.