dean harrington visual

B 4 mount on Sony FS7 camera

One of the factors on the Sony FS7 camera that seems to follow the Sony EX3 is that there is no power connector for a B4 ENG lens on the camera body. If you get the Metabones Ultra for full frame images on the FS7 you'll get the full S35 millimetre picture on the camera with power for canon ENG lens … that's a big plus for ENG shooters. If you don't have a B4 a power socket to Sony lens mount … how are you going to power a 2/3 ENG lens?
D-TAP is one way you can do so on the FS7 … so, I'd advise shooters with this camera to get a battery (BP-U65 for example) that has the ability to power the combination of ENG len and FS7. Allister Chapman has designed, with MTF, just such a B4 mount for the FS7 and a D-TAP cable to connect the ENG len to a D-TAP power source.
The BP-U65 battery will not be available on AMAZON.JP after the end of June … so, if you are considering a powerful battery that has been tested and proven to work on the FS7 camera … you will need to move quickly on the remaining BP-U65 batteries that are listed at present.
Good luck and Good shooting!