Thanks for Wayne and Chuck's confirmation, then we may only be able to shoot
at F4 with the 7-14 at 7mm :-) I would prefer to use my 16mm fisheye with
OM5D II.
C.H.Ling
----- Original Message -----
From: "Wayne Harridge"
>
>> 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
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