tgrey wrote:
> See the Canon 1-series tips white paper:
> http://www.photoworkshop.com/canon/EOS_Digital.pdf#search=%22eos%201-class%20digital%22
>
> This suggests USM of 300, 0.3, 0 to offset the effect of the AA
> filter. It's not specific to any particular camera, and I find it's

The 300, 0.3, 0 variables are oke for removing small detail softness as caused by the AA filter. But there are many more uses for usm...
In short you can use usm for
- small detail retrievement
- better contrast
- defogging

and to add some numbers with this
- small detail retrievement 400 - 0,3 - 0 till 200 - 0,5 - 0
- better contrast 100 - 1 - 0 till 30 - 8 - 0
- defogging 20 - 30 - 0 till 10 - 50 - 0

I often use a combination of these settings on a picture, a normal routine could be...
usm 10 - 30 - 0
usm 30 - 6 - 0
usm 150 - 0,5 - 0

But there are NO correct numbers, it totally depends on
- in camera processing
- type of raw conversion
- noise
- contrast
- pixelsize
- desired effect
- subject
- subjectsize
- etc