Quote:
Originally Posted by SkyWatch
Woops: sorry about the 5mm exit pupil I said earlier: I divided 200 by 40 instead of 30...  |
Dean,
I am not quite sure why you're dividing 200 by anything to work out the exit pupil. The easiest way to calculate the exit pupil is to divide the focal length of the eyepiece by the F-ratio of the telescope. In this case we have a 40mm eyepiece and an 8"/f6 newtonian.
Exit pupil = 40/6 = 6.67mm exit pupil. No 200's anywhere in there.
Cheers
John B