Black Magic URSA/$6K 4K B-4, PL, & EF lens Mount
 

Blackmagic Design: URSA

No lens $6K, so add on another $$$ for lens preference depending on what mount you prefer or use EF mount and use DSLR lensing.

Obsolescence is not an issue with this camera, as it's sensor is upgradeable as new sensors are developed.