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+--- Thread: How camera-dependant is CA? (/showthread.php?tid=3327)
How camera-dependant is CA? - boren - 03-15-2011
Someone over at dpreview forum claims that pictures from his K20D display less CA than what he gets with the K10D and K7 (using the same lenses). Has anyone else noticed significant differences in CA between different cameras using the same lenses?
How camera-dependant is CA? - Guest - 03-15-2011
Which kind of CA he was talking about? Lateral or longitudinal CA? Or was he talking about "purple fringing"?
A link would be helpful ...
Ciao, Walter
How camera-dependant is CA? - boren - 03-15-2011
Here's a link to his post:
http://forums.dpreview.com/forums/read.asp?forum=1036&message=37976239
How camera-dependant is CA? - Brightcolours - 03-15-2011
So... that sheds no light on the matter. Not clear what he was referring to as "CA".. usually, we are talking about lateral CA when talking about CA, and it means that one or more wavelengths of light are being projected by the optics larger than other colours/wavelengths. This mainly is noticeable at contrasty edges near the frame sides, where coloured edges appear.
Since the chromatic aberration happens in the optics, one would not see a difference from one camera body to the next.
Probably the poster was talking about the more elusive "purple fringing", which is not "CA". But, since no examples are being shown, we can't be sure.
How camera-dependant is CA? - genotypewriter - 03-16-2011
[quote name='boren' timestamp='1300207018' post='6821']
Someone over at dpreview forum claims that pictures from his K20D display less CA than what he gets with the K10D and K7 (using the same lenses). Has anyone else noticed significant differences in CA between different cameras using the same lenses?
[/quote]
There are lots of factors that can make the visibility of CA different. Some digital cameras even do in-camera processing to hide CA artifacts (e.g. newer Nikons) and almost all manufacturers and photo editing software offer some way of doing this at least in post. Maybe you're referring to this.
But strictly speaking, CA is dependent on two things:
1. Lens
2. Viewing magnification
Purple fringing is both lens and medium related. It shows up more on digital but it also depends on the lens design.
GTW