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According to William Optics, the flattener lens needs to be 55mm away from the chip on a DSLR with std T-Ring. The SBIG has 17.5mm backfocus so 55-17.5 = 37.5mm spacer. I found that a 35mm spacer worked well for me.
The QSI documentation says the wsg8 with t-mount adapter has 50.17 backfocus, so theoretically 55-50 = 5mm spacer?
It's difficult first time around because if it's not in focus you can't see any stars!
Andy
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