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08-29-2010, 07:23 AM   #1
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Pentax 16-50 F2.8

Hi ,

Your advice please. I have recently aquired the 16-50 Pentax lens.

I know there have been QI re - focusing and soft peripheral images.

Focusing seems fine. Edges seem slightly soft. Is that the nature of the lens or am I being too critical.

Is there any sure way of determining what is normal for this lens and what is not ?

Thanks very much for your replies.

Adam.

08-29-2010, 07:30 AM   #2
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At 16mm and F2.8, you can expect the edges to be somewhat soft- however, the effect should diminish at F4 and higher- see if that's the case and if so, things are more or less normal.
08-29-2010, 08:06 PM   #3
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According to reviews the lens has a couple of focal lengths that have inconsistent sharpness but is mostly very good.
Pentax SMC DA* 16-50mm f/2.8 ED [IF] SDM - Review / Test Report
08-29-2010, 08:21 PM   #4
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thanks for your reply, adam

08-29-2010, 08:51 PM   #5
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This is a good lens (if it's a good copy).
Edges should be sharp at all apertures (with the caveat Adam gave) *if* you can be sure the subject matter is *precisely* the same distance from the lens throughout the frame (that's the catch!)

Hence the constant reminder given - go out there and shoot real life images and forget the lab test results!
08-30-2010, 09:33 PM   #6
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Since this discussion is abut lenses, not cameras, I'm moving it to the proper forum.
08-30-2010, 09:43 PM   #7
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Looks like you double-posted Adam. Some of us replied in your other thread here: https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/112653-16-50-f2-8-qc.html
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