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Originally Posted by xrekcor
John,
I have the 3.5mm, 10mm, 14mm XW's I haven't noticed chromatic aberration in any of them, but then again it maybe my in-experience, if it were pointed out to me that maybe different.
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Trust me its there on all of them. Minimal, but if you get Jupiter/Venus/Moon right on the field stop at high power you can see it at the edge, adjacent to the field stop. You will get this on any widefield and it does not affect viewing performance at all.
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I do find with the XW's if there is a fault with them it is eyeplacement. When I first slotted the 14mm I must say at first I was a lil disappointed. It appeared a tad out of focus towards the edges. However after playing with the eyeplacement and adjusting the eyeguard this disappeared. All three are tack sharp to the EOF in my f/6 newt.
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This is experience. Once you get used to using eyepieces that are a little more critical of eye placement you get used to putting your eye in the right place. The early Naglers are even more critical than the Pentax XW's are for eye placement and blackouts.
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Have you been able to try the 2" 30mm XW?
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No, but I would like to.
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And what about the nagler 26mm t5? does it suffer the same field curverture like the 31mm t5? I did like the 20mm t5 of Houghy's so maybe they might be a better option for wide FOV views.
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Not IMO, I rate the 26mm NT5 as the best 2" long focal length widefield eyepiece I have used period. The 20mm NT5 is also up there as one of the best ever, excepting its eye-relief is now too short for my worsening eyes as I now need glasses when using eyepieces of 20mm focal length in fast scopes. If you don't need glasses at the eyepiece the 20mm NT5 is an absolute cracker.
CS-John B