In this video I go over my custom FS7 build, which uses B4 Broadcast and Cinema lenses such as the Canon HJ21x7.5, a very nice 2/3" B4 cinema zoom, with a super long parfocal zoom ratio of 21x. It also has a macro switch to focus as close as the front lens element.

This rig was built to hold heavy and long lenses like this and uses several parts that I designed and made myself.

Music used in this video:
Warm Horizon by Purrple Cat
Way Home by tokyowalker4038
Blushes by Dj Quads