This eyepiece is specifically designed for use with 65 mm and 85 mm Razor HD spotting scopes - it is not compatible with the 50 mm Razor HD models.
Magnification: 18x (65mm) / 22x (85mm)
Objective lens diameter: n/a
Eye relief: 31mm
Linear field of view: 54m (65mm) / 43m (85mm) @ 1000m
Field of view: 3.1° (65mm) / 2.5° (85mm)
Exit pupil: n/a
Close Focus: n/a