DA* 16-50 paranoia is upon us again. Since I use mine almost every
day, I figured I ought to show a sample of how it renders the most CA
prone subject possible: dark tree branches against a white sky. Yes, I
know that no one in their right mind shoots tree branches against
white sky, but sometimes they end up in frame, as they did here.
Here's the entire frame:
http://photo.net/photodb/photo?photo_id=8817194
And here is a crop of the branches against the sky at 100%:
http://photo.net/photodb/photo?photo_id=8817201
There's some glow around the street lamp. Don't know that I'd call it
CA. Speaking in purely technical terms and having examined it at a
pixel level, I think I would categorize it as "glow."
Hair against sky can also be a problem. Some of my FA primes produce
considerable CA shooting digitally in these conditions. Here's Grace's
hair against the sky at 100%, cropped from the above frame:
http://photo.net/photodb/photo?photo_id=8817198
Look at the horrible band of green atop her head!! Oh wait, that's a
headband.
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. Two of the worst offenders are the A400/5.6 and the esteemed K
85/1.8. That being said I still use both of those lenses and consider
them excellent, particularly the latter. But I don't shoot branches
with them:-).
Paul
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