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Thats at 3556mm FL!. get the largest pixel size you can and not too large a sensor at a guess, think a full 35mm frame might be a problem.
ZWO ASI482mc at $579 , 5.8um pixel size and .34 arc sec (oversampled) Res pops up, but its colour. Most CMOS cams will be massively oversampled at this FL, but always binning would be an easy option. If your keen on really long exposure deep sky, look for a S/H CCD with large pixels.
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