
So I got this extension tube as a loophole until Canon comes out with their own. When I opened it to inspect the test tubes, it was immediately clear that the item had been used. I see fingerprints on all the metal clasps. There's also sticky slime everywhere. I tried wiping them off but they are sticky. I will NEVER put that between my R5 and RF 50 f1.2! Buy something else, like Japanese-made Kenko extension tubes instead of Chinese junk.

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