QSI has a system that allows use with Nikon & Canon lenses.
The issue of vignetting with 1.25inch filters depends on the distance between the filter and the chip. If the filter is further away, the more likely vignetting is to occur. Probably worse with external filter wheels. The QSI has an internal filter wheel which puts the filter very close to the chip, so it can cope with lower f-ratio optics (which have a wider light cone) without vignetting.
DT
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