Tele Vue's 17mm ETHOS is an ideal complement to the 31mm Nagler Type-5. They are parfocal (both have focus locations about 3/8" above shoulder) and the 31mm Nagler Type-5 has exactly twice the true field area.
| Model # | ETH-17.0 |
| Focal Length (mm) | 17 |
| Barrel Size (in.) | 2" |
| Apparent Field of View (deg.) | 100 |
| Eye Relief (mm) | 15 |
| Weight (lb / oz) | 1.55 / 24.8 |
| Field Stop (mm) | 29.6 |