But your OM5D II has small pixels too. For diffraction limited shooting
you'll be limited to about f/9-10.
Chuck Norcutt
C.H.Ling wrote:
> 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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