The Kowa TE-20H 25x Long Eye Relief Eyepiece provides an extremely long eye relief and is compatible with the TSN-880 and 770 series spotting scopes. Its extremely long eye relief of 32mm increases the distance between the rear element and the location which your pupil can be, while still being able to observe the entire field of view. Naturally, this comes at the cost of less apparent field of view, but if you must wear glasses or sunglasses it is the most comfortable option for use.
| Magnification | 25x |
| Angle of View | 2.3° |
| Field-of-View (@ 1000 Yds) | 120' (40 m) |
| Exit Pupil Diameter |
3.1mm with TSN-770 Series 3.5mm with TSN-880 Series |
| Eye Relief | 32mm |
| Relative Brightness |
9.6 with TSN-770 Series 12.2 with TSN-880 Series |
| Twilight Factor |
44 with TSN-770 Series 47 with TSN-880 Series |
| Weatherproofing | Waterproof & fogproof |
| Dimensions | Not specified by manufacturer |
| Weight | Not specified by manufacturer |