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Thanks Rod, but calculating the exit pupil isn't the thing I'm after. By having such a large exit pupil, to what degree am I reducing the diameter of my scope?
This 65mm eyepiece is a Russell Optics XL Super Plossl. Sure it's field of view is only 38* due to the 2" barrel size, but because of this I get no coma problems, & I can comfortably get the maximum FOV a 2" barrel will allow. Not for urban use as the sky glow is a killer. Its eye relief is about 4"! so not to everyone's liking, but it is unique.
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