I see this Viltrox EF-M2 adapter is very similar to the metabones speed booster for only $200, considering getting this along with the 18-35mm and see how it goes. any one else use it?
Right now I have the 12-35mm ii.
thanks
We have topic (without much info, but) - http://www.personal-view.com/talks/discussion/18395/viltrox-canon-ef-to-m42-electronic-speed-booster-adapter
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