I have been doing manual drift alignment using DSLR D5300 before the weather in Malaysia turns awful, but the results were not the best. I am using a skywatcher reflector 150/750,mount eq3 pro,maximum getting 20s of subs (unguiding, only with drift alignment and sidereal rate, sometimes with accurate GOTO but 20s of subs also), therefore I would like to ask is 20 seconds exposure adequate , or is it the best my scope can do, if with guiding, what is the maximum exposure time it can do?
Can anyone here share their drift alignment star image(I mean the one with angle of deviation, and please indicate the directions in the image as well, so I can have a better reference), thanks.
And one more thing, do I have to turn on the sidereal tracking when I am doing the drift alignment?
Any advice given would be greatly appreciated. Zi Hao