带分划板的变倍双目望远镜

Vart-focal binocular with graduation

本文叙述了原苏联的ＢＫ７～１２×３５，ＢＫ７～１４×３６和ＢＰ１０～１６×４０变倍双目望远镜。给出了这些变倍双目望远镜与固定放大率双目望远镜相比的实验室试验结果。试验结果表明原苏联研制的变倍双目望远镜在光学和技术性能方面基本上与固定放大率双目望远镜不相上下。而且表明研制带分划板的变倍双目望远镜将会导致放大率变化范围的增加，可观察角视场的增大，结构的改进和重量的减轻。

Vary-focal binoculars of former Soviet Union,BK 7～12×35,BK 7～14×36 and BP 10～16×40 are related.The experimental results are given,comparing these binoculars with fixed focusones.Results show that optcal and technical properties of two kinds of binoculars are almost the same,and that the vary-focal binotular with graduation will lead to the increasement of variation range of am-plification and angular field,the improvement of structure and the reduation of weight.