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The dust spots may be more difficult to see when used as a guide camera for deep sky, but when imaging extended bright objects such as the Sun and Moon then they become quite visible. Flat Field frames will calibrate them out, but it is a real nuisance if they keep coming back.
I noticed that as I unscrewed the nosepiece to clean the glass, small specks of loose red anodisation material were plastered all over the threads, so I used a cloth with IPA to thoroughly clean the threaded body to remove the loose flakes.
However, even with the UV/IR filter permanently fitted on the nosepiece, I still get debris appearing in the FOV and have to clean the camera every 4 to 6 outings, even though it is stored capped, in a clean, small plastic box.
Cheers
Dennis
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