The 2" / 50.8 mm wide-angle eyepieces of the Luminos series from Celestron offer a comfortable 82-degree apparent field of view. These parfocal eyepieces require little to no refocusing when switching between different magnifications. With a 20 mm eye relief, they are also suitable for eyeglass wearers. The eyecup can be adjusted by rotating the rubber coating. It features a polished and anodized aluminum barrel that is scratch-resistant. Focal length: 23 mm, field of view: 82°, eye relief: 20 mm, field stop diameter: 37 mm, coating: Fully Multi Coated, optical design: 6 lenses, barrel diameter: 2" (50.8 mm), parfocal: Yes, weight: 480 g.