Focal length: 55mm
Barrel Diameter: 50.8mm (2″)
Apparent Field: 50°
Eye relief: 38mm
Field Stop Diameter: 46mm
A must for deep sky fans. This good low power/wide field eyepiece has the largest true field and largest exit pupil possible for 2″ eyepiece holders-3 times the field area of any 1 l/4″ eyepiece.
Performance with Schmidt Cassegrains is remarkable since it avoids the image degradations and severe vignetting which occurs when using tele compressors.
The long eye relief and unique adjustable eye guard allows eyeglass wearers to see the full field of view even with their glasses on.
The rubber grip gives sure grip and makes it comfortable to use in cold weather.