I just ordered it from B&H and got the clicking noise. It has a pinch style cap. I have to leave for a trip tomorrow so I'll complain to Canon when I get back.
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As a side note, this color phenomena also applies to the Narrows in Zion...or would if the House of Representatives hadn't thrown a temper tantrum and closed the National Parks...which is a real pity...hopefully that situation will be resolved by late October/early November (best times for Zion).