If your subjects move, you need the F2.8

The F4 VR III should be o.k. in a studio setting where everyone shoots F8.  For any sporting events - you will need the F2.8 VR II.  

It is not just F stop.  For example, the mechanism enables the 70-200mm F2.8 VR II focus a lot faster than the 85mm 1.4 G AF-S.   

Did not use 70-200mm VR I, can't comment on it.   

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good point -mdq100- 给 mdq100 发送悄悄话 mdq100 的博客首页 (0 bytes) () 01/10/2013 postreply 11:00:51

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