Pagman wrote in post #18491312
Hi Roy, next time i will give it more exposure, I held back this time because although my nikkor 300 f4 lens is sharp, I thought closing it down a bit would help the IQ and because of the lens length on a crop body, I understood 1-2 sec's was the borderline to avoid trailing, with the Iso I thought above 1600 would just be no good.
If its the same weather tomorrow I will try at f4 and Iso 3200 but keep the sh speed to 1 sec.
Do you think 30 light frames are enough and without any darks, when they are being stacked.?
I have no idea how many would be best for you. I've stacked as few as four, with pretty good results, and over 100 without gaining much improvement. I suppose it depends upon the subject, the ISO (noise), and the overall exposure. However, I doubt that you will be able to get the histogram peak very far away from the left edge while being limited by your exposure criteria (no tracker), but you need to be sure the entire peak is away from the left side or you will be very underexposed, and won't see much benefit from stacking. I doubt that you would gain much by trying for more than thirty, though - at least at this stage. Good luck... BTW, even though darks are beneficial, I seldom shoot anything but light frames, unless I expect the single images to be especially noisy. Not the best method, but I'm usually fairly happy with my results. Experimentation is the best teacher!