12-04-2010, 03:11 PM
[quote name='Brightcolours' timestamp='1291470806' post='4755']
PF and LoCA are NOT the same thing. LoCA is green and magenta.
[/quote]
I'm starting to wonder if "PF" is simply a sub-case of LoCA. See it as a parallel to the SLT ghosting effect. The relative intensity of the fringing in lower contrast scenes is different than the case you have very bright highlights.
I have an idea for a test I can try at home to show this...
Alternatively, there is a possible way to disprove it too. Anyone have a photo showing PF clearly in front or behind the focus region that isn't due to lateral CA, and also a photo from the same lens showing LoCA colours in the respective defocus region? If my suspicion is correct, then the PF can only happen where the LoCA is magenta-ish, and shouldn't elsewhere.
PF and LoCA are NOT the same thing. LoCA is green and magenta.
[/quote]
I'm starting to wonder if "PF" is simply a sub-case of LoCA. See it as a parallel to the SLT ghosting effect. The relative intensity of the fringing in lower contrast scenes is different than the case you have very bright highlights.
I have an idea for a test I can try at home to show this...
Alternatively, there is a possible way to disprove it too. Anyone have a photo showing PF clearly in front or behind the focus region that isn't due to lateral CA, and also a photo from the same lens showing LoCA colours in the respective defocus region? If my suspicion is correct, then the PF can only happen where the LoCA is magenta-ish, and shouldn't elsewhere.
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