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Hi All
IMHO the obsession with lower exposure times is to settle for less than decent images.
The more photons you collect the better your signal to noise ratio and the better your image quality.
If you dont have the expensive and quality mount with guiding then track and stack. The photons dont care if they are collected in one exposure or one thousand exposures. The stamina of the observer will determine the length of the total exposure.
Some astrophotographers go for exposures in excess of 12 hours. It just depends on your expectation.
It is also my understanding that larger focal ratios mean smaller FOV's and smaller focal ratios mean larger FOV's. Large aperture allows for fainter objects to be seen and that would be the advantage of the larger aperture.
Kind regards
Steve
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