I tested my DA* 16-50 after the first sample I bought was replaced due
to misaligned elements. Shooting a brick wall at f2.8, it was sharp
across the field at all focal lengths. Unfortunately, I discarded the
shots, and I rarely shoot anything that's truly flat enough to serve
as a test. But here's a recent shot of Grace at f4 and 50mm. I checked
the hi-res version at 100%, and it shows good edge sharpness in areas
where there is detail at the edges.
http://photo.net/photodb/photo?photo_id=8558534
On Jan 31, 2009, at 4:26 PM, jtainter wrote:
Does anyone else who has this lens notice pronounced edge and corner
softness at longer focal lengths? I notice it above 40 mm. or so. It
is easiest to see if you enlarge the image. The lens performs much
better in the corners at shorter focal lengths.
I am about to send Pentax my DA* 50-135 F2.8 (which won't focus
automatically or manually) and my K20D (which has a defect in the
sensor). I'm deciding whether to send the 16-50 as well (although if
the optics are misaligned it is unlikely that the repair service can
correct it).
Perhaps this is normal performance for the 16-50.
Thanks,
Joe
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