|
The quality of an acceptable mirror also depends on its purpose.
For visual use where you may want to go 500X magnification for planetary, you need the best mirror you can buy.
For imaging with a camera you are using the mirror at its lowest magnification, given by the formula :-
Aperture(mm) / 7.
So a 200mm (8in) mirror is about 29X mag and a 16in about 58X.
So for imaging a mass produced mirror is OK, for visual a custom built mirror may be required.
|