Atomic Posted January 27 Share Posted January 27 Hi all Total newbie at guided imaging. I intend to purchase a second hand mono ccd or cmos camera and guide camera to have a go at longer exposure tracked imaging. I have been reading reviews on some cameras and am puzzled about a cameras suitability for different focal length/ratio of telescopes. I note that many refer to short to moderate focal ratios, say f4 to f6. Firstly, I dont understand why this is significant except that a telescope with a focal ratio of f10 would have a slightly dimmer image projected onto the sensor than say a F5 instrument. Why is this important? Secondly what would be the effect of using a telescope with a focal ratio outside the recommended guidelines? i have a 200mm f5 newt and 285mm f10 SCT here. EQ6 goto mount Thanks Martyn Link to comment Share on other sites More sharing options...
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