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| p.1 #2 · different versions of 16-35mm Version 1? |
Many Canon USM lenses have been updated during their production life from the older raised switches to the newer ribbed, flat ones. The change is so minimal as not to be identified with a I or II. Presumably the change was based on feedback from the klutzy users who tend to accidentally move the older type of switches. I find the newer switches more difficult to use in general, and a real problem with gloves.