out of curiosity
suppose you have a refractor 100/500 + barlow 2x and a newton 200 / 1000
you take a picture of a galaxi, same magnification
a longer integration time for the refractor the focal ratio being f10 vs F5
with the refractor you should achieve an higher contrast with the newton an higher resolution
All other things being equal which is better ?
Edited by zoltrix, 18 September 2021 - 06:24 AM.