Yes, the 7mm in the formula is your max pupil dilation, which is accepted as 7mm for a young adult, decreasing with age.
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Originally Posted by Jeff
A couple of months back I purchased an Panoptic 35mm for use in my f/5 dob reflector, but my ageing 43 year old eyes could not cope with the 7mm exit pupil
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Major bummer! I'm just about 40, with very imperfect eyes (thankfully no astigmatism), and don't have a problem with 7mm exit pupils yet. Does this mean I'll be selling my Pan35 in a couple of years? I hope not, I love it!!
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The 30mm GSO SuperView (68deg) and 26mm Meade QX (70deg) 2 inch eyepieces suffered from heaps of coma used with my scope
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I agree, they're both ordinary at f5, but at f6 the QX is actually not too bad.
I've been on a quest for widest field for a little while, tried all the easily available cheaper ones, but alas none of them was worth having. The Pan35 is the go if you can stretch to it. I did get a 40mm Konig last week for the f6, but haven't had a chance to try it yet.
Cheers,
Jason.