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I’d speculate that the 294 would be pretty competent well over 1m. The high conversion gain mode, deep wells and good dynamic range should make it pretty versatile. You’d probably want confirmation from someone who owns one that they calibrate correctly. Horrors stories and all (that may be just that).
One potential advantage to the QHY version is the potential to switch it into 47MP mode for shorter focal lengths. Apparently, the quad-Bayer array means that each 4.6um pixel is actually 2x2 2.3um pixels. (Or should that be 4.8 and 2.4?) and can be read as such. A trick the ZWO model doesn’t do.
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