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| p.1 #3 · Eyepiece vs. eye cup (5DII) |
I keep an "eyecup" in my bag, but use it only very rarely. I've lost a couple of "eyepieces" over the years, and always replace them with OEM parts.
BTW, the Canon "eyepiece cover" is called an "eyecup", see pages 7 and 100 of your 5DII manual.