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Need more versatility than the 25/40x100 Long-Range Observation binocular? This is a modified version of the 25/40x100mm, but with 1.25" non-rotating helical focusers instead of permanently-mounted eyepieces on rotating turrets. A matched pair of 25x (24.43mm) fully multi-coated wide-angle eyepieces are included. And because the helical focusers are a non-proprietary 1.25" design, your favorite 1.25" eyepieces can be used as well. The eyepieces do not rotate when focusing- a feature found only on high-end helical focusers. The rest of the binocular, including the semi-apochromatic triplet objectives, is the same proven design as found in the original 25/40x100mm. And just like the 25/40x100mm, broadband multi-coatings (non-reflective green/purple) are used throughout, including on the massive porro prisms. Complete package price includes binocular, removable handle, lightweight nylon form-fitted case, wooden tripod with removable table-top tripod, 25x oculars. An optional 7x50mm correct-image finderscope (as shown at lower left) is available. Binocular is pre-tapped for the finderscope's precision-ground dovetail base (no adjustment required- just lock it in and it's aligned). Because accurate collimation is critical at the high magnifications these binoculars are capable of, every Oberwerk binocular is thoroughly tested and collimated to perfection at the Russ Research Center in Beavercreek, Ohio. Objective size 100mm (f/l 620mm) Magnification 25x included, accepts any 1.25" eyepieces. Prism BAK4 Optic coating Fully Multi-coated including all oculars Field of view 25x- 2.5° Apparent FOV- ~67° Exit pupil diameter 25x- 4mm Exit pupil distance (eye relief) 25x- 16mm IPD (inter-pupil distance) range 58-80mm Weight 26 lbs, tripod 16 lbs.

BT-100 with wood tripod and optional 7x50 finderscope