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Old 10-09-2019, 12:50 PM
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AG Hybrid (Adrian)
A Friendly Nyctophiliac

AG Hybrid is offline
 
Join Date: Nov 2009
Location: Toongabbie, NSW
Posts: 1,581
Due to what Duncan said regarding these eyepieces being designed for telescopes that are no longer in production, they are not all effective in each type of telescopes or a broad range like Naglers are.

If I remember correctly. The 10mm XW and shorter focal lengths were rather well corrected in even sub-F5 reflectors but the 14mm and above induced heavy field curvature. I remember testing this myself a couple years back. I couldn't stand them in my 12" without a coma corrector/field flatterer.

I tested the 14, 20, 30 and 40mm and they were bloody awful without a corrector. And only passable with it. If you want a 14mm with essentially the same ergonomics, fov and image quality as a Pentax get a Delos 14mm instead.

Should be good in your refractor though.
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