I'm considering getting myself a Nagler 22 mm Type-4 eyepiece, and I would appreciate your advice.
The Nagler 22mm would likely become my primary wide-field eyepiece and would be used mainly for my SD81S f/7.7 and Tak FC-100 f/8. I already own a Bresser 40 mm 2" eyepiece but the exit pupil is a bit too large for my skies (around 5.2 mm), and I think I see too much field curvature in this eyepiece.
I do like the prospects about the Nagler 22 because it offers a generous 19 mm eye relief as I need to wear eyeglasses correcting for astigmatism. However, I've read posts about CN'ers reporting seeing field curvature with the Nagler 22, but these reports seem to be from observers using reflectors without a Paracorr. So, I'd like to ask the collective wisdom and experience on CN for advice and insights: Should I expect to see field curvature when using a Nagler 22 Type 4 in my APOs?
There is a small catch: I already own a Pentax XW 20 mm which is in many ways an excellent 70-degree eyepiece. However, I think it too has a bit too much field curvature when comparing with my Delos 14, so I'm wondering if the Nagler 22 would be better. The ES 92 degree 17 mm eyepiece is also an outsider-option under consideration, but I'm somewhat put off by its massive size and weight, but on the other hand it does seem to get rave reviews by owners. By contrast, the Nagler 22 is an older design but still gets much love from its owners.
Any insights will be appreciated.
Edited by db2005, 22 July 2019 - 01:20 AM.