Quote:
Originally Posted by dvj
My intent with the question is to simply understand the f-ratio myth better and how to explain it.
There are no 2um or 4um pixel cameras that I am aware of, but I wanted to keep some constants in the model. 200mm aperture, pixel size matched to the focal length as per Nyquist theory.
|
Best to get it out of theory and into practise.
You have 2 approx 12 inch F3.6/8 scopes being used on this site - An APRHA by Peter Ward and a 12 inch Orion Optics UK F3.8.
They both are producing images that have not been seen with similar aperture but longer focal length.
So there is something that occurs there. Perhap the little variables of pixel matching, less effect of seeing, simpler optical paths, less prone to tube currents, efficiencies of larger pixels add up to a noticeable difference.
Greg.