|
The f ratio myth is real. You cannot beat real aperture. An f3 200mm aperture telescope will collect far more photons than an an F3 lens of 50mm FL say.
You did mention Niquist theory so obviously you understand sampling theory.
It is a complex balance of sampling and inherent brightness.
It is absolute heresy to say that an equivalent aperture at f/8 is as good as one at f/3 for dim extended objects!
By the way for star intensities only aperture rules. For nebulosity only focal ratio is the only arbiter.
One has to balance the the pixel size of the detector to the optic. The sampling here is important for final resolution.
What was the question again?
Bert
|