LensRentals looks inside the Canon 16-35 f/4 IS
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LensRentals looks inside the Canon 16-35 f/4 IS

On disassembling the 16-35mm, Roger noticed the ridged texture of the zoom ring, underneath the rubber. According to him, this is probably good news:

'I think this may solve two problems we’ve seen on some recent Canon lens releases, like the 24-70 f/2.8 Mk II. First, it should help the zoom rubber stay in place (stretching zoom rubber is a minor problem on that lens).  Second, it should strengthen the actual zoom barrel. On several recent lenses the barrel has been made so thin that a dent in it will freeze, or at least really stiffen, the zoom ring. This barrel feels a lot stiffer than some previous lenses, which we could easily bend by just squeezing too hard'