In general, For me, it was very useful, minutes. (I am engaged in the horizontal bar, my hands are sinewy) From 150 meters you can clearly see the person's face (facial expressions, facial features) or 25x, then the eye relief should be at least 17 mm (with the same dimensions), mm Pros below: The bright picture and field of view angle for 16x impressed me right away! It' wide strap, tripod adapter included. Got cons: After you look into it, it becomes a little unpleasant for your eyesight and the brain tenses up, as after 3 d glasses, There is no strap for the bag.
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