Samyang's APS-C fisheye — same as ID 553. 180-degree diagonal coverage at f/3.5 for multiple mounts.
The Samyang 8mm f/3.5 UMC Fish-Eye CS II is a manual-focus APS-C fisheye prime producing a 167° diagonal fisheye field of view on crop-sensor bodies. Available in per-mount variants including Canon EF, Nikon F, Sony E, and Pentax K. Ten elements in 7 groups with 1 aspherical element. Six aperture blades. No filter thread — the bulging front element prevents filter attachment. Weight varies by mount (~465g Canon EF variant). 0.30m MFD. Manual focus only.
Ten elements in 7 groups (1 aspherical element). Six aperture blades. No filter thread (bulging fisheye front element). Weight varies by mount variant (~465g Canon EF). Minimum focus distance of 0.30m. Manual focus only — no AF motor on any variant. f/3.5 maximum aperture. APS-C (CS = Crop Sensor) image circle — 167° diagonal fisheye on APS-C bodies. Detachable petal hood (CS II feature, improved over original CS).
The CS II designation indicates the second-generation Crop Sensor fisheye: the CS II added a detachable petal hood over the original CS version, improving protection and allowing storage. The 167° diagonal on APS-C provides the full circular fisheye distortion characteristic. Manual focus only — no autofocus version of the Samyang 8mm f/3.5 exists. UMC (Ultra Multi Coated) coating reduces flare and ghosting.
On the used market the Samyang 8mm f/3.5 UMC Fish-Eye CS II is affordable as a manual-focus APS-C fisheye. Condition checks: manual focus helicoid smoothness, front element for marks. Manual focus only — no AF. APS-C only. Available in multiple mounts — confirm mount variant matches your body before purchase.