Kowa TE-80XW Eyepiece 35x/40x Extreme Wide (TSN-770/880/99)

- Magnification: 40x (99 Series) 35x (880/770 Series)
- Field of view (degree): 80
- Exit Pupil Diameter: 2.5 (99/880 series) 2.2 (770 series)
- Relative Brightness: 6.3 (99/880 series) 4.8 (770 series)
- Twilight Factor: 59.3 (99 series) 55.5 (880 series) 51.9 (770 series)
- Eye Relief: 17.0mm
- Field of view at 1000m: 39m (99 series) 45m (880/770 series)