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anybody got experience with these viltrox focal reducer/speedbooster/whatever you wanna call it? thinking about buying one for my canon m5, but there seems to be some iffy reviews mentioning things like stabilization turning off after a couple of seconds, lenses being unable to find focus, etc but they seem to be mentioning the bmpcc and lumix ones instead of the canon m series ones. sucks though because if i could confidently buy it, i really like the idea of being able to buy ef primes and use them at 2 different focal lengths by switching between the regular adapter and the viltrox
