谈谈前苏联的“双伴儿”镜头刘爽前苏联不仅是军事大国，而且也是照相机和各种光学镜头生产的大国。其解体后的各光学研制生产单位，在光学镜头的研制与生产上，非但没有减少，反而大有增多之势。特别有趣的是在同一厂家生产的镜头，同一焦距中常有双胞胎产品供应市场，不... Talking about the “twin children” lens of the former Soviet Union Liu Shuang The former Soviet Union was not only a military power, but also a large country in the production of cameras and various optical lenses. After the disintegration of the optical development of production units, in the development and production of optical lenses, not only did not reduce, but greatly increased potential. Particularly interesting is the same manufacturer lens, the same focal length often twins supply market, not ...