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I use a STXL16803 and QHY600m.
Yes the QHY certainly have sub frame capability.
If you are using MaxIm just draw a box within the frame and select a subframe readout.
Also its CMOS binning does not work in the same way as the CCD. There is no QE improvement but the file size does become more manageable.
Lastly, for ultra dim objects I've found the CCD (when well calibrated) has a lower noise floor than CMOS which has an albeit very faint fixed pattern noise.
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