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适马(Sigma)17~50mm F2.8 EX DC OS HSM(图1)是针对APS-C规格数码单反相机设计的镜头,具有OS防手震补偿系统和F2.8恒定光圈,可以完成大多数题材的拍摄。近日接修了该款镜头,故障现象是对焦很费力,对焦马达嘶嘶作响,对焦动作比“蜗牛”还慢,同时变焦的手感也十分涩重,必须倍加用力才能转得动变焦环懒洋洋地完成变焦。客户介绍,该镜头在使用中不小心被摔了一下,撂到地面上,就坏成这个样子了。在众多的镜头故障现象中,镜头被摔损坏占比很大,绝大多数都有明显的摔坏痕
Sigma Sigma 17-50mm F2.8 The EX DC OS HSM (Figure 1) is a lens designed for the APS-C digital SLR with OS anti-shake compensation and F2.8 constant aperture for most subjects Shooting. The recent repair of the lens, the phenomenon is the focus of the trouble is very focused, focus motor hissing, focusing action than “snail ” is also slow, while the zoom feel is very heavy, you must double the force to move the zoom ring Lazy zoom out. Customer introduction, the lens accidentally being in use fell a moment, 撂 to the ground, the bad into this look. Among the many lens failure phenomenon, the lens is a large proportion of the drop damage, the vast majority have obvious signs of broken