12-04-2010, 04:03 AM
[quote name='Lomskij' timestamp='1291400276' post='4741']
Interesting. However I'm a bit confused by the following (longitudinal chromatic aberrations):
"As the human eye and autofocus systems are particularly sensitive to green light, both manual focus and autofocus tend to bring the green image in sharp focus. The other colors of the spectrum are left defocused and add up to a magenta fringe. For this reason purple fringing is more common than green fringing."
Is that so?
[/quote]
I can't see how this can be true for phase detect AF. Also if you're focusing on something black and white, the human eye can't differentiate between red, green and blue. But you still get fringing.
It's true that a Bayer sensor sees more contrast in green but I doubt it's the cause for PF because, like I said, PF doesn't exist with well corrected lenses.
So far the most suspicious thing to me is LoCA reacting with surrounding photosites.
GTW
Interesting. However I'm a bit confused by the following (longitudinal chromatic aberrations):
"As the human eye and autofocus systems are particularly sensitive to green light, both manual focus and autofocus tend to bring the green image in sharp focus. The other colors of the spectrum are left defocused and add up to a magenta fringe. For this reason purple fringing is more common than green fringing."
Is that so?
[/quote]
I can't see how this can be true for phase detect AF. Also if you're focusing on something black and white, the human eye can't differentiate between red, green and blue. But you still get fringing.
It's true that a Bayer sensor sees more contrast in green but I doubt it's the cause for PF because, like I said, PF doesn't exist with well corrected lenses.
So far the most suspicious thing to me is LoCA reacting with surrounding photosites.
GTW