|
I understand that CMOS chips are less sensitive to low light levels than CCD chips? Won't make any different when photographing the Moon, Jupiter, Saturn.
Black dot in the centre of a large defocused image of a star, Moon or planet - yes, sounds like the secondary mirror.
But what do you mean by "webcam hooked up to eyepiece"? "Afocal" (as compared to "Prime Focus") means that you poke the webcam at the eyepiece - where you would normally place your eye. But you would have to play with the focus of the webcam - I haven't done this (but I'm going to to see if I can aid my Cheshire collimation step on my big dob) so I'm not sure how it would perform. One might have to adjust the webcam focus and the focusser position to get a sharp image??
|