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Peter, Rob is correct. The QSI has an internal filter wheel - total backfocus including filter wheel and OAG is 53mm - one of the main reasons I chose the QSI. I have to change the front black cover from the one with built in off axis guiding to the plain cover so that the backfocus distance is correct for a Nikon lens - I'll piggyback this rig to another scope for guiding. I can now attach any Nikon lens to this CCD camera.
Yes Paul, it's the 14-24 - you'll need the WS cover and Nikon adapter. Forecast is looking good for testing this out tonight, albeit it from suburbia. Might try a big widefield Ha of the Milkyway.
DT
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