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I have a Quark and a 70D. It's not practical to get focus with the DSLR as the sensor is too far back.
Ideally you'd want a video camera with a large monochrome sensor and fast readout but if you were going to go for just one of those things, I'd go for the larger sensor. The inbuilt barlow in the Quark means that it takes lots of frames to build up a full disk with just a 80mm scope.
I use a QHY5L but might ask Santa for a ASI174 for that reason.
Steve.
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