Metabones, makers of the very highly regarded speed booster, announced in a press release that they will, in fact, be producing a Speed Booster specifically for the Blackmagic Pocket 4K Camera. This is the most relevant part below, if you don’t want to read the entire press release from Metabones.

Announcement by Metabones on March 22, 2019

I owned and loved the Metabones Speed Booster for the original Blackmagic Pocket Cinema Camera and got exceptional results with all my old Nikon glass. I did a quick comparison test of the original 5 years ago here:

Not being one to wait, I’ve already acquired the Metabones Speed Booster XL and will report my experience with that in a future post with test footage. The XL works perfectly on the BMP4K and is available in Nikon and Canon flavors. It’s pretty much a permanent fixture on my new Pocket 4K.