Sorry, by "converter" I was referring to the M-to-M4/3 converter you were using for your 35cron.
The Canon Thread - Page 175
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Honestly, though, I don't remember paying that much for it. Fits tight on both the camera and lens with no perceptible play. I think if I changed lenses more often, I would get the OE Panasonic or Voightlander adapter but my other M-mount lenese are 90 and 135mm which are effectively too long for what I want to do with MFT.