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Telephoto lens and focal length being longer that single lens. |
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| Sep17-10, 04:40 PM | #1 |
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Telephoto lens and focal length being longer that single lens.
1. Why is a telephoto lens considered to have a longer focal length than that of a single convex lens?
A lens combination, such as a diverging and a convex lens, is referred to as a telephoto lens. Suggest why a telephoto lens is considered to have a longer focal length than that of a single convex lens. |
| Sep17-10, 06:04 PM | #2 |
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Wiki appears to have as good an explanation as any...
http://en.wikipedia.org/wiki/Telephoto_lens |
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