CES1103 Features: Spotting scope 100 mm (3.9'') Diameter 45 angled APO refracting Waterproof 540 mm Focal length (f/5.4) Fully multi-coated optics Low dispersion fluoro ED glass Zoom eyepiece 22-67x Soft case Aperture: 100 mm (3.94 in) Focal ratio: 5.4 Magnification 1: 22x-67x Angular field of view: 1.9 / 0.9 Linear field of view (@1000 yds): 100 / 50 Linear field of view (@1000 m): 33 / 17 m (108.27 ft) Eye relief: 20 mm (0.79 in) Near focus: 26 ft (7.92 m) Prisms: Bak-4 Dimensions: Focal length: 540 mm (21.26 in) Optical tube length: 20 in (508mm) Weight: 89 oz (2523.11 g) Dimensions: 6'' H x 9'' W x 26'' D