The BTX combines the visual power of both eyes with a revolutionary viewing experience. Crucial subtleties can be seen with the crystal clear optics, with every detail now fully on show. A forehead rest and angled view guarantee comfortable viewing for hours on end.
| BTX 65mm | BTX 85mm | BTX 95mm | BTX 115mm | |
| Magnification | 30x | 30x | 35x | 35x |
| Magnification Plus ME1.7x Extender | 50x | 50x | 60x | 60x |
| Effective Objective Lens | 65mm | 85mm | 96mm | 115mm |
| Exit Pupil diameter | 2.2mm | 2.9mm | 2.7mm | 31.mm |
| Ext pupl distance | 21mm | 21mm | 21mm | 21mm |
| Fisld of view | 38 m/1000 m 112 ft/1000 yds |
38 m/1000 m 112 ft/1000 yds |
32 m/1000 m 96 ft/1000 yds |
32 m/1000 m 96 ft/1000 yds |
| Field of view (degrees) | 2.1° | 2.1° | 1.8° | 1.8° |
| Field of view, eyeglass wearers (degrees) | 2.1° | 2.1° | 1.8° | 1.8° |
| Field of view, apparent (degrees) | 60° | 60° | 60° | 60° |
| Shortest focusing distance | 2.2 m 7.2 ft |
3.8 m 12.5 ft |
5.0 m 16.4 ft |
5.0 m 16.4 ft |
| Diopter adjustment left/right | ± 4 dpt | ± 4 dpt | ± 4 dpt | ± 4 dpt |
| Diopter correction at ∞ | > 5 dpt | > 5 dpt | > 5 dpt | > 5 dpt |
| Interpupillary distance | 56-72 mm 2.2-2.9 in |
56-72 mm 2.2-2.9 in |
56-72 mm 2.2-2.9 in |
56-72 mm 2.2-2.9 in |
| Objective filter thread | M 67x0.75 | M 87x0.75 | M 97x0.75 | M 118x0.75 |
| Approx. length* | 371 mm 14.6 in |
404 mm 15.9 in |
458 mm 18.0 in |
472 mm 18.6 in |
| Approx. weight | 2195 g 77.3 oz |
2520 g 88.8 oz |
2760 g 97.3 oz |
3520 g 124.2 oz |
| Functional temperature | -25/+55°C -13/+131°F |
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| Storage temperature | -30/+70°C -22/+158°F |
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| Submersion tightness | 4 m 13 ft |
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| Tripod thread | 1/4˝ UNC; 3/8˝ UNC | |||
