On Mar 22, 2009, at 9:46 AM, Paul Stenquist wrote:
DA* 16-50 paranoia is upon us again. ...
Seriously, the DA 16-50 s is probably the most CA-free (or perhaps
second best to the DA* 50-135) from among my twenty or so Pentax
lenses. ...
huh? Not for me. I felt this lens was a good performer but never
really liked using it all that much. Never had anything really bad to
say about it either. That summation seems a bit of hyperbole.
Looking at your example, Paul, I see a bit of R/G CA, a bit more Y/B
CA, and a bit of blooming (aka fringing). It's harder to see in your
example as the edges against the sky are blurred.
Depending on the focal length, when I look at my photos made with this
lens, I've typically dialed in -30 R/G and +60 Y/B CA correction. On a
more extreme case in my files (sharply focused barbed wire against
overcast sky), it needed a bit more (-36, +82) as well as fringing
reduction. No big deal: it's well within the range of possible
corrections.
The DA21, FA43, DA70, FA77, and DA14 all require smaller corrections,
on average. Zooms are nearly always harder to correct, of course.
Godfrey
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