Quote:
Originally Posted by bmauter
...So what you're saying is that really fast lenses tend to exhibit this more frequently than slower lenses and that if you nail focus, the CA is minimized.
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No. What I'm saying is that really fast lenses tend to exhibit this more frequently than slower lenses, and
stopping down (using a smaller aperture) will minimize it. Also avoiding overexposure/blowing out any highlights/backlit subjects/hard specular highlights--but sometimes you can't control that. Purple fringing and sensor bloom are a different kind of chromatic aberration than is usually talked about (the cyan/red variety, where the refraction of the glass has caused light of different frequencies to separate to different locations). Purple fringe and red fringe are typically caused by some form of
sensor bloom, where the charge on the sensor overflows to neighboring pixels. I think. It's been a while since I looked up the
varieties of CA.
