Focus length is defined at infinity, most zooms are much shorter than the
marked focal length at close distance.
C.H.Ling
----- Original Message -----
From: "Ken Norton" <ken@xxxxxxxxxxx>
> >
>> If all of the tests were set up the same, why are some images and
>> highlights
>> different sizes?
>>
>
> Those are 100% crops in Studio 2. The positioning is a little different
> because of something else we discovered about these lenses--they aren't
> all
> exactly lined up the same. Hmmm. (although some of this difference may
> possibly be caused by changing position of the sensor even though IS was
> turned off, but after the camera resets with lens changes, who knows...)
> Same with the apparent focal-length of #1 not quite looking like 50mm even
> though the exif says 50mm.
>
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