Straight binocular head fitted with precision prism system. Interpupilary distance adjustable 50-75 mm Focussing by large knobs on both sides and motion by rack and pinion mechanism. Interchangeable transparent or milky glass plate in the base with two stage clips. Wide field eye-piece : x 10 (paired) or x15 (paired) Fixed achromatic objectives of x2 or x4 Magnification : Fixed x 20 or x40, x30 or x60 Supplied complete with dust cover. To submit your enquiry, please click on the product of your choice B10385