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> Why are special-purpose digital cameras for telescopes so much cheaper than for microscopes? It is more a matter of what the application demands. If you have time to adjust gain and exposure each time you take a shot, cheaper CMOS/USB is a way to go, although even those get expensive beyond the 1.3 Mpix. On automated systems, you need some means of full auto exposure adjustments, and perhaps need to deal with lower light conditions which favours CCD. Finally, you can - within limits - offset low mag optics with a high pix res camera. Regards, br
