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适马（ＳＩＧＭＡ）７０－２１０ｍｍＦ４－５．６ｕｃ变焦镜头李敬阳由适马光学有限公司开发生产的７０一２１０ｍｍＦ４—５·６ｎｃ变焦镜头是目前我国市场上常见的一种中长焦变焦镜头。该头光学设计采用成熟的１３片９组结构，滤镜尺寸Ｑ５２，外形尺寸６７．５Ｘ７９...
Sigma SIGMA 70-210mmF4-5.6uc zoom lens Li Jingyang developed by Sigma Optics Co., Ltd. 70 210mmF4-5 · 6nc zoom lens is currently on the market in China a common telephoto zoom lens. The head optical design using mature 13 9 group structure, filter size Q52, size 67.5X79 ...