Selling my Viltrox EF/RF adapter .71 speed booster. This speedbooster is a Viltrox version of the Canon .71 focal reducer. I was lucky enough to snag one of these before Canon put the squeeze on them and made them stop production. They are considered to be arguably better than the Canon for half the price. The Canon has known issues of displaying a purple flare dot when shooting into certain lighting. These have been tested side by side with the Canon and are considered to be as good if not better because they don't produce the purple dot. this is the Pro lens locking version that secures large lenses tightly so they won't wiggle at all. I bought this for my c70 when I was still shooting EF glass. I quickly switched to RF and only used this on a handful of shoots. It's basically in perfect condition. These are hard to find now. If you are in the market for a canon speed booster, save yourself some cash and go with this. You won't be disappointed. Let me know if you have any questions. Thanks for looking.