So that would suggest that perhaps the DA 60-250 was designed to be
used with both formats. That would certainly be a plus.
Paul
On May 11, 2009, at 10:39 AM, Margus Männik wrote:
Unfortunately DA*50-135 doesn't fit FF. Wide open you can see dark
corners clearly at 50mm, vignette achieves the maximum at 70mm and
then reduces to mild falloff after 90mm (but you can still see it at
135mm). Stopping down makes it worse and at small apertures you can
clearly see a round "imaging area" at all focal lengths.
BR, Margus
Paul Stenquist wrote:
True enough. I haven't tried my DA* 50-135 on full frame, but I
expect the results would be similar. I know the DA 50-200 covers
full frame. But if you believe Ned and the Pentax website, none of
these lenses were designed for full-frame use. As you point out,
the 60-250 may be different in that regard. Or not. Some of those
early roadmaps were full of confusing nomenclature.
Paul
On May 11, 2009, at 9:45 AM, Mark Roberts wrote:
Paul Stenquist wrote:
Well, there you have it. Only minor vignetting. Would that
increase or
decrease at a smaller aperture?
It's probably falloff, rather than vignetting, and it would
improve at
smaller apertures.
In any case, it's probably useable on full frame, although I would
think it's optimized for APS-C.
Since it was originally designated the "D-FA 60-250" I expect it was
designed for full-frame (they probably changed the designation to DA
when they decided to eliminate the aperture ring), but since
virtually
all lenses show some light falloff at wide apertures and are sharper
in the center than the corners, any lens could be considered
"optimized for APS-C" :)
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