Aperture vs Focal Ratio to determine exposure time


topboxman
 

Please see the following Cloudy Nights thread about aperture vs focal ratio:

https://www.cloudynights.com/topic/617363-speed-of-optics-example/

Personally I believe focal ratio helps determine imaging speed and aperture determines SNR. I know it gets complicated when optics mix with camera like image scale.

Let me know what you think?

Peter

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