I have just acquired my ASI 120 MM but there has been little clear sky. Anyway I tried it out in daylight for some Lunar captures and then in darkness on Jupiter. In all cases I used my SCT 9.25" at f/20. I use AS!2 and Firecapture software (free). For all my Jupiter exposures I get a pixel matrix appearing on the final stack. Is this usual or a fault with the camera?
