Samyang's APS-C cinema wide — 21mm T1.5 for video-focused mirrorless APS-C shooting.
The Samyang 21mm T1.5 AS UMC CS is a cinema prime from Samyang's CS (Cinema Series) for APS-C cameras. T1.5 is the cinema T-stop (actual transmission aperture). AS = aspherical; UMC = ultra multi-coated; CS = cinema series. This entry: Fujifilm X mount (APS-C coverage).
T1.5 maximum aperture. 21mm focal length. De-clicked aperture ring (cinema standard). Manual focus with geared focus ring (follow-focus compatible). AS aspherical element. UMC coating. At approximately 310g. 77mm filter thread. Fujifilm X mount (APS-C).
Cinema lenses use T-stops rather than f-stops — T-stops measure actual light transmission, enabling consistent exposure across multiple cinema lenses on a production. De-clicked aperture enables smooth iris pulls in video. The geared focus ring accepts standard follow-focus rigs. APS-C coverage (not full-frame). Manual focus only — no AF.
On the used market the Samyang 21mm T1.5 CS is a cinema prime for APS-C cameras and small-sensor productions. Condition checks: 77mm front element, de-clicked aperture ring smoothness, geared focus ring engagement, manual focus operation. Fujifilm X mount (APS-C) — no AF.