I thought this was a replacement for my lost Canon eyecup and it took about 5 minutes. The lining came loose in my camera bag and the first time I used it it was pointless. I thought maybe it was just the one, but the second did the same. The "rubberized" cup detached from the plastic over the course of the day. I bought another one from another company and it's been great for a few weeks now. Luckily it was a cheap mistake.
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