Powerful 10-30x zoom optical system for an image that is close-up to the action or provides a wide shot Large 50mm objective lens with excellent light gathering capability BaK-4 prisms and multi-coated optics provide improved contrast and resolution by increasing light transmission through the entire optical path Eyeglass friendly with generous eye relief and sturdy, twist-up eyecups with multiple stops Carry with ease with the handy belt case Tripod adaptable {Specification} Magnification: 10x - 30x Objective Lens Diameter: 50mm (1.97") Angular Field of View: 3.7° - 2° Linear Field of View (@1000 yds) / @1000 m): 186.9ft - 101 ft (57m - 30.8m) Exit Pupil: 5mm - 1.7mm (0.2" - 0.06") Eye Relief: 16.2mm - 12.5mm (0.64" - 0.49") Close Focus: 8.2 ft (2.5m) @ 10x Twilight Factor: 22.36 - 38.73 Relative Brightness: 25 - 2.9 Limiting Stellar Magnitude: Ideal: 10.99 Moderate: 9.99 Poor: 8.99 Lens Coatings: ...
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