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Originally Posted by Waxing_Gibbous
Having used both the Pentax XWs and T5 & 6 Naglers (side by side for 10/11mm, 13/14mm and 5mm) I can only agree with John's excellent post, particularly his comments on colour fidelity and sharpness.
I would add only one other factor: the Naglers are more forgiving with eye relief IMO. While the Naglers 'allow' up to about 15-20mm, the Pentax EPs positively require it. I found 'kidney-beaning' and blackout to be major issues with the XW, unless my eye was perfectly placed. This I found pretty uncomfortable and so settled on Naglers.
I can't however fault the actual view with the Pentax XW series - beautifully crisp across the field and very neutral colour.
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Hi Peter
From my experience I think it depends on the eyepiece.
With the Nagler type 1, I found eye placement very difficult each time I tried it out. I hear kidney beaning was particularly inherent in this eyepiece tho. Yet for the owner, it's not an issue.
The Nagler 17mm (type6 I think), I had no problem.
The Pentax 10mmXW (a workhorse) I have no problem with eye placement (If I did in the beginning, I can't remember). Yet I find the 7mm XW trickier. It doesn't get a whole lot of use so perhaps that's why and I do notice if I use it for a long session I'm fine with it.
And here's the weirdest one of the whole lot... The Denkenmeir 14mm was really bad on my first use. Someone else got theirs the same time as me and sent me a pm of how hard the eye placement was on the first use. A message from him the next day told me it wasn't a problem anymore & had now become his favorite ep. Exactly the same thing happened to me- the second night I didn't know what all the fuss was about- eye to eyepiece and off I went straight away, just like him.
Dare I say, eye placement is just a matter of getting used to I think.
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