Nikon Announces Two New AF-P DX NIKKOR 18-55mm F/3.5-5....
Nikon announced two new DX lenses (I reported on that rumor last month). The new AF-P stands for "fast and quiet AF with adoption of a stepping motor for AF drive operation":...
Nikon announced two new DX lenses (I reported on that rumor last month). The new AF-P stands for "fast and quiet AF with adoption of a stepping motor for AF drive operation":...
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镜头焦距与拍摄距离 拍摄野生动物是动物摄影师的最高追求,充满着刺激与挑战。要想在野外环境中拍摄那些危险的动物,必须确保...
皮带宽度500mm,长10米,爬坡高度4.5米,电动滚筒3.0kw,直径250mm,转速为1.23m/s,求大神帮帮忙给设计一个,CAD图纸、caxa图纸都可以,...