Quote:
Originally Posted by Atmos
As Ray mentioned, all of this is a good way to give an indication of how long your exposures need to be to compare one optical system to another. In the real world though, it is a little pointless when trying to calculate what camera/telescope to use. Personally, I believe that your pixel scale should pretty much be the determining factor. The reason for this comes down to what you're wanting to do.
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Overall agree with your philosophy, but think that you are missing the primary real-world driver in the direction of efficient imaging. With weather like we are currently suffering, opportunities to image are few and far between and having the most sensitive system (with appropriate resolution) becomes critical in getting good enough data on desired objects. Since relatively minor changes in system geometry can have really significant impacts on imaging time, I think that a tool that allows one to choose between different options on the basis of sensitivity may serve a valuable purpose.