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to find the glass isn't made by TV anymore but in Tiawan/China
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I don't think that matters at all. It's still made to TV's specifications and is QC'd by TV in the states.
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If you like extended periods observing at the ep I'd go for the XW's on axis they're sharper, alot more contrasty which helps bring out finer detail. And the difference in 70 - 82 degrees is debatable besides in that outer 6 degrees either side in the TV's fall apart anyway
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What focal length are you referring to? In my experience testing the 13mm NagT6 vs the 14mm Pentax XW, yes the Pentax was a *tad* sharper on-axis, but the nagler was overall the better eyepiece (full and comprehensive review coming soon), sharp all the way to the edge, and no field curvature like the Pentax.
I know the 7mm and 10mm Pentax's are superior to the 14mm Pentax, but I don't think it's fair to generalise that Naglers fall apart at the edge because it's just not true from the ones I've looked through. And in terms of contrast, it's fairly subjective IMO - all of the eyepieces I tested were fairly equivalent when it came to contrast and the difference was negligible.
Both EP's are comfortable to use, no blackouts or kidney beaning in either of them, obviously the Pentax has more ER which is a plus if you wear glasses (I don't).
Just my thoughts.
In the coming months i'm hoping to do a shootout between the shorter focal length Naglers and Pentax's as well.