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I have had all 3 of the Nagler T4's for ages. The 17mm is also excellent, but a notch behind the Nikon NAV HW. The 17mm is possibly my most used eyepiece in my 14" and 18" scopes. The 22mm also gets plenty of airplay. I do find both the 17mm and 22mm T4's benefit significantly when used with a paracorr in any Newtonian faster than about F5.5
Cheers
John B
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