12-08-2010, 10:00 PM
[quote name='Tiz' timestamp='1291842510' post='4878']
I understand that most of the blur caused by an AA filter can be reversed by using more sharpening (compared to a body w/o an AA filter).
Does the same principle apply to lenses (i.e., can a large amount of the blur cause by a low-resolving lens be compensated by additional sharpening)?
Thanks.
[/quote]
No, the diffusion caused by the AA filter is much less pronounced than on a mediocre lens. Basically a AA filter diffuses by a factor of 1.1-1.3x which can be recovered by sharpening because this is still a diffusion on sub-pixel level. However, beyond that the diffusion is really lossy. A bad lens blurs across -say- 3px or more in the corners (thus resolving only a fraction of the potential resolution).
I understand that most of the blur caused by an AA filter can be reversed by using more sharpening (compared to a body w/o an AA filter).
Does the same principle apply to lenses (i.e., can a large amount of the blur cause by a low-resolving lens be compensated by additional sharpening)?
Thanks.
[/quote]
No, the diffusion caused by the AA filter is much less pronounced than on a mediocre lens. Basically a AA filter diffuses by a factor of 1.1-1.3x which can be recovered by sharpening because this is still a diffusion on sub-pixel level. However, beyond that the diffusion is really lossy. A bad lens blurs across -say- 3px or more in the corners (thus resolving only a fraction of the potential resolution).