>The plastic cap on my 18, same as the 16, comes off in a light wind. I had
>actually thought about putting some felt in the rim.
If you use the step up ring lens shade then the standard 72mm caps fit
... and stay on. For the 16mm I use one of those fat rubber bands that
comes with the broccoli. I'd use it even if the felt weren't worn out
rather than risk that glass.
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