Quote:
Originally Posted by Camelopardalis
The bottom line is signal to noise ratio (SNR).
If you have two telescopes and cameras which result in comparable angular resolution per pixel, the larger scope will collect more photons per pixel. More photons means more signal.
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I thought this only applies to stars, not extended objects, for which the faster the f-ratio the stronger the signal regardless of aperture given the same arcseconds per pixel and same RN and same QE and...
I believe the main advantage of a larger aperture when doing pretty DSO pictures is smaller spot size.