12-04-2010, 03:28 PM
[quote name='popo' timestamp='1291475496' post='4756']
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.
[/quote]
I have no idea why you wonder why PF is LoCA. It looks different, the colour usually is different, and where LoCA shows magenta and green, PF always is on its own in one colour (from blue/violet to red-ish).
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.
[/quote]
I have no idea why you wonder why PF is LoCA. It looks different, the colour usually is different, and where LoCA shows magenta and green, PF always is on its own in one colour (from blue/violet to red-ish).