I've never used the Brevis35, but I'm a huge fan of lens converters (I shoot with the XLH1 and a P+S Technik Mini35 almost everyday)....
... but I HAVE seen some really impressive test footage from the Brevis35, especially considering the dirt cheap price.
We have a little HV20 to use as a crashcam, and I have been planning to buy a Brevis35 for use with it (among the really good test footage I've seen was an HV20 demo). It's nice that you can get one of these tiny/cheap units with a real PL mount. Hopefully it will be pretty sweet. I will give a review here as asap.
T2
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Todd Terry
Creative Director
Fantastic Plastic Entertainment, Inc.
fantasticplastic.com