Body: Binocular, Rotatable 360°, Cast Aluminum Alloy Construction Zoom Ratio: 6.5:1 Zoom Range: 0.7x – 4.5x Zoom Knobs Markings: 0.7, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5 Zoom Control: Dual, graduated, bilateral Magnification: 7x – 45x (10x eyepieces) Objective Lens: Brass Construction Field of View: 32mm – 5.1mm Working distance: 110mm Eyetube Inclination: 45° Eyepieces: 5x, 7.5x, 10x, 12.5x, 15x, 20x, and 30x (optional) Interpupillary Distance: 54mm – 75mm Dioptric Adjustment: Dual (+/- 5 diopters) Extended Mag Range: 2.1x – 270x (With auxiliary lenses and eyepieces) Extended Working Distances: 45mm – 332mm Mounting: Fits 84.5mm Diameter Focus Holders (optional) Auxiliary Lenses: 0.3x , 0.4x , 0.5x, 0.75x , 1.5x and 2.0x (optional)