I have no experience at all with SGP, but I do have quite a lot with FocusMax V3 and V4. I believe that FM results are excellent. Given the discussion re masks where the precision of the cut of the mask may influence focus whether or not grabber software is used I personally wouldn't have any faith in comparing SGP focus to that of a mask, grabber software included. Why not install free FMV3 and use that to compare? I think the results would be much more illuminating.
Peter
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