Quote:
Originally Posted by Atmos
I can answer a little, 30mm is 30mm whether it is a 1.25" or 2". A 30mm 1.25" plossl gives near to the maximum FOV that you can get from a 1.25" EP at maybe 42ºish but so does a TeleVue 24mm Panoptic with its 68º FOV. Moving to a 2" means that you may be able to get 80º FOV in a 30mm as opposed to the constrictive 42ºish.
Moving to 2" should give better off-axis views because you're using less of the usable FOV.
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Hi Colin,
42ºish FOV is more applicable to Kellner type eyepieces, Plossls are better than that.
44º FOV is applicable to 40mm 1.25" Plossl eyepieces, but most other 1.25" Plossls have FOV of 49º to 52º.
Regards,
Renato