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btw, I have a QHY533C which I have paired with a Sharpstar 130HNT (FL = 364mm, f2.8) and I think this image scale (2.13 arcsecs per pixel) works well for many targets. The 2600 and 533 have the same pixel size (3.76 micron) and so the image scale (arcsecs per pixel) will be the same for both sensors, you're just getting a wider field of view with the 2600 (albeit at a much higher cost, and likely a larger (or more deformed) spot size in the image corners compared to the 533)
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