Kowa TE-11WZ II 25-60x PROMINAR Wide Angle Zoom Eyepiece

The first of its kind! This eyepiece contains 2 XD lenses to deliver outstanding sharpness, even at 60x magnification!  *Compatible with TSN-99, TSN-88, TSN-880 and TSN-770 Series. Kowa PROMINAR XD Lenses Kowa's XD Lenses (eXtra-low) dispersion glass with similar characteristics to fluorite crystal) combines with a special dispersion concave lens to reduce a very high percentage of chromatic aberration for the ultimate viewing experience. Chromatic aberration is limited at the highest level.  Eye relief of 17mm remains constant throughout the magnification range. SPECIFICATIONS Magnification: 25 ~ 60x Wide Zoom (TSN-880/770) 30 ~ 70x Zoom (TSN-99) Real Field of View: 2.4° ~ 1.32° (TSN-880/770) 2.2° ~ 1.2° (TP556) Exit Pupil Diameter: 3.5 ~ 1.5mm (TSN-880) 3.1 ~ 1.3mm (TSN-770) 3.2 ~ 1.3mm (TP556) Relative Brightness:12.3 ~ 2.3 (TSN-880) 9.6 ~ 1.7 (TSN-770) 10.2 ~ 1.8 (TP556) Twilight Factor:46.9 ~ 72.7 (TSN-880) 43.9 ~ 68.0 (TSN-770) 49.2 76.2 (TP556) Eye Relief: 17mm