04-20-2011, 05:37 PM
[quote name='Christos' timestamp='1303320073' post='7790']
Klaus I quite don't understand what the AA filter does?
[/quote]
Well, its function is the suppression of moiree effects (Anti-Aliasing).
This is an example for a moiree effect:
[url="http://en.wikipedia.org/wiki/File:Moire_on_parrot_feathers.jpg"]http://en.wikipedia.org/wiki/File:Moire_on_parrot_feathers.jpg[/url]
The AA filter does so by softening - it is a low-pass-filter in front of the sensor.
Your 5D II has a very weak AA filter for instance which is why you perceive it as very sharp. Some of this is "false" detail and moirees at times but my personal opinion on this is ... who cares as long as things look sharp. Others disagree here.
Klaus I quite don't understand what the AA filter does?
[/quote]
Well, its function is the suppression of moiree effects (Anti-Aliasing).
This is an example for a moiree effect:
[url="http://en.wikipedia.org/wiki/File:Moire_on_parrot_feathers.jpg"]http://en.wikipedia.org/wiki/File:Moire_on_parrot_feathers.jpg[/url]
The AA filter does so by softening - it is a low-pass-filter in front of the sensor.
Your 5D II has a very weak AA filter for instance which is why you perceive it as very sharp. Some of this is "false" detail and moirees at times but my personal opinion on this is ... who cares as long as things look sharp. Others disagree here.