With an opening of 10 cm, this binocular is a real double telescope, which has more opening than some small telescope - twice. For maximum mechanical and collimation stability, the Skymaster 25x100 has a reinforced housing with medium rod and integrated tripod bracket. With 4 kg weight and 25 times enlargement, you need a stable tripod so that the binoculars can play its strengths. Then it provides pictures that you will not forget - regardless of whether you look into the sky or target earthly goals.