|
I find I have to guide using an off axis guider to avoid star trails - I presume this is due to slight mirror shift on the main SCT rather than any differential flexure on my other two OTAs. This places high sensitivity demands on the guide CCD and whilst the Meade DSI is up to it for bright stars - imaging say the Helix nebulae on a new moon at 10 second intervals barely lets me lock on to a guide star with careful selection.
So I figured a CCD with more sensitivity would be a boon!
|