[frank]

[quote name='Klaus' timestamp='1337577102' post='18365']

We moved somewhat away from the "LoCA" description again. Nowadays we are using "Bokeh Fringing" (BF) here. Technically LoCAs are part of BF but BF is a broader term.





Here's an example for Purple Fringing (PF):

http://www.opticallimits.com/images/8Reviews/lenses/sony_135_28/pf.jpg

The water is "sharp" (=in focus) yet the bright spots are surrounded by these fuzzy purple halos.



These are "Lateral CAs" (to the left):

http://www.opticallimits.com/images/8Reviews/lenses/tokina_1224_4/ca.jpg

The quadrant is in focus yet it shows these distinctive (non-fuzzy) color shadows. The colors are different depending on the side of the quadrant. Lateral CAs are either yellow/blue or red/green.

[/quote]



Thank you, Klaus.



So, if I understand it correctly: LoCA occurs in out-of-focus area (so it is part of BF); Lateral CA and PF occur in in-focus area. Then, Laterial CA and PF are distinguished by colours in an image--PFs have a purple colour, and Lateral CAs have yellow/blue or red/green colours. Am I right?



Sorry I did not follow the long and detail posts of BC and Wim since those posts are too technical for me.



Frank