Joining the previous ULTRA adapters announced in September, these new adapters combine very high precision optical elements to improve the performance on Micro 4/3 cameras, and essentially replaces the version 1 MFT Speed Booster for only a little more money. This adapter shouldn't be confused with the newer Speed Booster XL 0.64x adapter announced a few months ago that was specifically designed to work with the Panasonic GH4 (this ULTRA adapter should work with any MFT mount camera). It's also worth noting that while pretty much all full-frame lenses should work fine, some Canon crop sensor EF-S lenses can protrude too far for the glass inside, so you should check out the Metabones site for whatever adapter you're using just to make sure. B&H is saying August for the Nikon to MFT ULTRA and October for the Canon to MFT ULTRA, but it looks like you can get the Canon one from the Metabones store right now.
