Quote:
Originally Posted by rogerg
Is interesting looking at all these different variations of the same thing. I wonder why QSI had internal 1.25" filter wheel but SBIG says you need bigger than 1.25" ? Is that just because the SBIG filters are further from the chip? Or does the QSI have some vignetting? 
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Simply because the QSI unit is all in 1 and the filters are so colse to
the sensor that they dont vignete . If you want there is 31mm option
for same cost.