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jcjr
professor emeritus
Reged: 01/06/08
Posts: 563
Loc: TN, USA
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Re: Strange Results in Eyepiece FOV Comparisons
05/18/08 04:22 AM
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David, I haven't looked thru a lot of eyepieces, but found interesting that the Hyperion 8mm might have a wider view than advertised--
I have a 38mm Q70, supposedly 70 degree AFOV, but every time I look thru that thing, the AFOV seems huge. It gives the subjective impression of being much wider than some cheapie 80 degree AFOV UWA's I have, and that 38mm Q70 feels drastically wider than a 66 degree AFOV Expanse.
I might buy a 26mm Q70 to see if it gives the same 'huge' subjective impression as the 38mm Q70. Maybe the 38mm Q70 just subjectively seems wide because of the huge eyelens, but it is a very repeatable subjective impression. Every time I look thru the 38mm Q70, it just slaps me in the forehead, "Boy, that's an awfully wide view!"
Is the large eyelens the likely explanation? Or maybe the big exit pupil?
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CPC 1100, C102SLT, SV F80, Meade 70 & 60 AZT
Q70 38mm, Pan24, Meade 5K 18mm UW, Axiom LX 15mm, 10mm, 7mm, Nagler 13T6, Expanse 20mm, 9mm, 6mm, BO/TMB 5mm, 2.5mm
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