B422.mp4 – Free Forever

: Standard for indoor, non-corrosive environments.

: This kit allows you to mount Blackmagic B4 lenses on RED DSMC2 cameras. : b422.mp4

If the ".mp4" in your query refers to a video file demonstrating equipment, it likely involves the —a standard for professional broadcast lenses. The Cineilux Adapter Kit : Standard for indoor, non-corrosive environments