Quote:
Originally Posted by AstroViking
Hi Peter,
Before the experts get in here, these are my two cents worth.
Longer exposures allow you to take fewer (overall) images for a quicker processing (stacking) time, but at the cost of potentially higher thermal noise in your camera. Your guiding also has to be better than the arc-seconds per pixel size of your camera. You also open up the possibility of capturing more light pollution and washing out the contrast between your target and the background.
Shorter exposures give less thermal noise per image but at the expense of longer processing (stacking) times. It also allows for slightly worse tracking, and doesn't capture as much light pollution.
The general consensus is that overall imaging / exposure time is what counts, not the number of individual images.
Given you're using a DSLR (presumably without any filters) in a reasonably dark location, then I would go for shorter exposures in the summer to try to keep thermal noise down, and longer exposures in the winter because heat issues aren't as great. Assuming you keep ISO and everything else the same...
Cheers,
V
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Ok cheers that makes sense.