Brandon 16mm 1.25" Parfocal Brandon Ocular With Rubber Eyecup (Standard)

Four element designs give a flat, beautifully corrected field of view.  Optical elements are exactingly ground and hard-coated with magnesium fluoride.  Precision metal parts are black-anodized for antireflection and machined to standard 1 1/4" diameter.  Parfocal mechanical designs - no need to refocus when changing eyepieces.  Comfortable exit pupil distance for observing ease.  Threaded at the base to accept all 1 1/4" Vernonscope Mounted Glass Filters.  Rubber eyecups eliminate stray light, roll down for use with eyeglasses.

Specifications

• Effective focal length (EFL): 16mm
• Apparent field of view (AFOV): 43 degrees, as calculated from the focal length and field stop diameter
• Eye relief: about 16mm
• Field stop diameter: 12mm, as measured with a caliper
• Weight: 1.6 oz