CalvinBird Offline Upload & Sell: Off
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p.1 #10 · p.1 #10 · Help Needed-Mark IV with 100-400 II zoom-Mechanical Problem | |
I had the same problem when I first purchased my brand new 1.4X III in 2013, sometimes it got loose, but when I intentionally turned the lens, it was tight. I tried it on 2 different cameras, attached on 2 different lenses, tried different walking style, I only figured out the problem was on the extender, but could not find out why, the pin and the hole looked fine. Finally I sent it in to Canon, after a few days, they inform me that they cannot fix it, and it was under warranty, so they just replaced a new one for me.
My suggestion is, send it to Canon to check it.
Calvin
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