[pure-silver] Re: making smaller prints with 8x10 enlarger
- From: Peter De Smidt <pdesmidt@xxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Wed, 13 Oct 2004 20:04:04 -0500
>> technically, "longer lens" and "telephoto
>>lens" do not mean the same thing.
>>
>>
>
>What is the difference?
>
>Leigh
>
>
A longer lens is simply a lens with a longer focal length. A telephoto
lens is a lens, of whatever focal length, which focuses with less
extension than it's focal length would indicate. For example, a lens
with a focal length of 12 inches needs roughly to be 12 inches from the
nodal point of the lens to the film plane to be focused at infinity. A
telephoto design of the same focal length might be able to focus on
infinity with only 9 inches from the nodal point of the lens to the
negative plane.
-Peter
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