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Hi Bill,
Your explanation makes perfect sense, the sensor area has to match your telescopes optical system at prime focus, most importantly the focuser barrel
My focuser has a 2” barrel and therefore a full frame sensor would probably be to large
If I were to upgrade my 600D at some stage in the near future then the obvious choices from the current series of high end Canon APS-C would be either the 80D or the 7D mark 2
The 600D has worked very well for me , just finished 3 hours of imaging on a cold but clear night in Sydney. Took some really clean images of Jupiter at 70 deg at ISO 200 and 400
Thanks again for all the replies, very informative and helpful I must say
Good evening
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