Amazon.com : MEKE 50mm T2.1 Super 35 Prime Manual Focus Cinema Lens for EF-Mount Cine Camera Compatible with Canon C200 C300 II, RED Komodo, BMPCC 6K, Z CAM E2-S6 BMPCC 6K Pro :
Zeiss CP.3 50mm T2.1 Compact Prime Cine Lens for Canon EF, Meter 2177-313