|
Unless you are going for an object with high dynamic range I don't see the point of different sub lengths. I know it's a long time since I studied maths but I can't imagine how it will improve SNR.
Just pick your camera's sweet spot and go for it. Some combination of exposures length and iso that will swamp read noise and not saturate the bigger stars too much. As Ryan said.
Maybe try dithering. That might help with fixed pattern noise etc?
|