Can someone explain why it seems like most EP once they get above around 24-25 if they are 68º or more, only or mostly come as 2" EP?
Does it have to do with the AFOV and the field stop and vignetting or ...?
I thought that as long as the EP is 31mm or smaller, that it could be a 1.25". I'm assuming that only applies at certain AFOV.
For instance, the Panoptic 27mm which has a 30.5mm field stop, all of which sounds like it should work as a 1.25" comes as a 2" EP.
Nagler 31 and 22 and Ethos 21 and even the 17mm are all 2" only.
The Hyperion 24 and 31 both do come with adapters to make them 1.25", but both are portrayed as if it's expected to use them as 2" EP. Is there a limitation so that if they are used as 1.25" they'd not work as well as when used as a 2"?