Quote:
Originally Posted by koputai
I beg to differ Wavy
|
I'd guess you're a lot younger than I am - my exit pupil is barely 6mm at best.
I have also done some tests to find out the effect on your pupil is arising from the image you see in your scope - while you may be able to achieve much more than 6 mm fully dark adapted, within seconds of putting your eye to the scope, if there are some nice bright "diamonds" in the field of view - open clusters in particularly - your pupil will shrink in seconds. A safer bet is a 5 mm pupil IMHO in most conditions.
Secondly, the actual field of view is determined by the diameter of the field stop of the eyepiece. Between 2 eyepieces with identical field stops - say a 30mm with a 65 degree apparent FoV vs. a 42mm with say a 55 degree apparent FoV, the higher magnification of the 30mm gives a darker background and should be used in preference to the 42mm because you will see more faint detail in the 30mm, with the same actual FoV across the sky.