Specifications

Feature	Value	Comment
features
Innovative	Variable magnification (25x to 75x ) zoom eyepiece.Twist-up eyecup.Good eye relief: 19.5mm(25X)-18mm(75X).First 82 degree Ultra Wide Angle Eyepieces on Spotting scope market.
Nitrogen Filled	Nitrogen filled.Rubberized fit and finish and light weight aluminum construction.
Any Position	Rotatable 360 deg. on its axis for increased ease of use and viewing comfort from any position.Retractable dewshield.
High-quality Lens	83 mm high-quality ED objective made with Japanese Ohara glass.True apochromatic performance. Bright and sharp to the edges.Excellent color rendition for nature viewing .
Rubberized	Green rubberized surface, ideal for outdoors activities and casual bird-watching.
Specification
Objective Lens Die (mm)	83
Objective type	Doublet, Air Spaced, APO
Magnifications	25X-75X
Coating	Fully multi-coated
Field of View (degrees)	42°(25X)-66°(75X)
Field of View	29.5m/88.5ft(25X)
Eye relief (mm)	19.5mm(25X)-18mm(75X)
Exit pupil (mm)	3.3mm(25X)-1.1mm(75X)
Near Focus (m/ft.)	7m/21ft
Length (mm)	560
Weight w/eyepiece (kg/lbs)	2.770/6.107
Release Date
First seen	2 February 2009

William Optics Swan 83 APO Spotting Scope