The Tele Vue DIOPTRX Adapter for NT6 Eyepieces converts Nagler Type 6 eyepieces, which have a smaller eyeguard, to a larger eyeguard size, allowing DIOPTRX-series astigmatism correctors to be installed. Note that these eyepieces have shorter eye relief than others recommended for DIOPTRX, so to minimize any vignetting, it's best to use these for deep-sky applications where your eye pupil is large.
The DIOPTRIX astigmatism correcting lens allows those with astigmatic vision to enjoy the sharpest viewing experience they've ever had, without using their glasses.
In the Box
Tele Vue DIOPTRX Adapter for NT6 (Nagler Type-6) Eyepieces