[rollei_list] Re: Lens Tests
- From: Don Williams <dwilli10@xxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Sun, 27 Mar 2005 12:08:35 -0800
At 10:10 AM 3/27/2005, you wrote:
>So I was wondering - should not lens resolutions be measured with the
>lens ALONE, and film resolution with the film ALONE? For suppose the
>lens can resolve 600 lp/mm but the film can't, won't the test end up
>skewed?
>
>And if one day digital sensors can be made with elements so small and
>so closely spaced that they are capable of resolving 600 lp/mm, won't
>that same lens perform "better"?
>
>Or else, could not lens resolution tests be done with extremely fine
>grain film like "Gigabit Film"?
I think you can measure lens resolution with an optical instrument placed
at the film plane. At least that seems to be how it's done on lens factory
production lines, film doesn't play a part as far as I know.
Don Williams
La Jolla, CA
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