howdie all, question for the more knowledgable.
having a big F ratio allows a narrow field view aka taking a photo you get more aparent resolution and more detail but at the expense of FOV.
having a low F ratio allows wide field shots although you can zoom in on things nothing beats Optical zoom over Digital zooming.
My question is if i where to stop down a 10" to say a 6" apart from the obvious factor that this will change the F ratio and subsiquently decrease the light capture, will this serve the same as having a high F ratio to do galaxy imaging or am i just reducing the light capturing ability with no gain.
Im just looking to confirm what CCD calc says. because the Camera FOV didnt change when the aperature decreased and F number where increased for a 40d.
Look forward to hearing what has to be said
