Thanks for that. It helps confirm what others have said that 1/30th is possible with f5.6. In my own experience handholding was perfectly possible with SFX and a Wratten 25 but the white foliage effect was largely missing. This indicates that handholding is possible with the full SFX filter as well, especially with a wide angle lens where f8 and 1/16th is likely to get a reasonable DoF and sharpness.