> C.H.Ling <> wrote:
>
> Isn't it the diffraction limit is also related to the lens focal length?
> As
> I remember the shorter the lens the faster it reach the diffraction
> limit.
> If you have a long lens, you can stop down more before it reach the
> diffraction limit.
>
Simplistically, the amount of diffraction is related to the "size of the hole"
through which the light passes, so yes a longer lens can be stopped down
further than a short lens before it has a diffraction "problem". A 200mm lens
at f16 has an effective aperture of 12.5mm, same as a 50mm lens at f4.
...Wayne
Wayne Harridge
http://lrh.structuregraphs.com
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