I have this stupid question which is bothering me. Would imaging lets say a 10" F/5 reflector + 2 x barlow making it F/10 will be the same as a 10" F/10 cassagrain?
Should be the same speed/field of view as the f/10 Eric...
But I have always wondered will you get less coma like a f/10 primary or are you still stuck with the level of a f/5?
I have always wondered this?
cheers