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07/25/2005 06:53:09 PM · #1 |
What is an element in a lens? Do more elements make a lens better?
What should I look for in a lens to be sure of clarity and sharpness of a picture?
Thanks,
Travis
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07/25/2005 07:00:14 PM · #2 |
Each element in a lens is an individual piece of glass. Elements can be of various shapes. They may have convex, concave, planar, asphereical (convex or concave) or any combination of these surfaces. They can be made of various types of glass with different refractive indices, or they can be made of fluorite, which is a type of salt! Some inexpensive lenses have plastic elements. the elements may or may not have anti-reflective coatings.
Some elements are paired together in "groups." In a lens specification, you might see "8 elements in 6 groups" and this means that there are two pairs of two elements (or one pair of three) and the rest are individual elements.
There's no way to tell from a lens specification, either by number of elements or groups, as to the quality of the lens. The best gauge of quality is real-world testing.
Message edited by author 2005-07-25 19:01:19.
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