Samyang's popular manual-focus APS-C ultra-wide — 18mm equivalent at f/2 for astrophotography and landscapes.
The Samyang 12mm f/2 NCS CS is a manual-focus APS-C ultra-wide prime providing an 18mm full-frame equivalent perspective. No autofocus, no electronic contacts — fully manual with no EXIF communication. NCS (Nano Crystal Shield) coating reduces reflections and flare. CS (Crop Sensor) designation confirms APS-C-only image circle. At 245g and 67mm filter thread. Six aperture blades.
The optical design uses 12 elements in 10 groups. Six aperture blades — produces hexagonal out-of-focus highlights at f/4 and below. The 67mm filter thread. At 245g the lens is lightweight. Minimum focus distance of 0.20m. Manual focus only — no AF, no electronic contacts. NCS coating. f/2 maximum aperture. APS-C image circle (18mm full-frame equivalent).
The 18mm equivalent at f/2 provides extreme ultra-wide coverage for astrophotography and indoor environmental photography on APS-C: at f/2 and 18mm equivalent, the NPF rule allows exposures of approximately 9-11 seconds before star trailing on APS-C, enabling Milky Way and star-field photography. The 0.20m MFD enables very close-wide environmental compositions. The six-blade aperture produces hexagonal highlights — note for photographers who prefer circular bokeh.
On the used market the Samyang 12mm f/2 NCS CS is affordable as a manual-focus APS-C ultra-wide prime. Condition checks: focus ring smoothness, NCS coating on front element for marks, and aperture ring operation. No AF, no EXIF. APS-C only. Compatible with Fujifilm X, Sony E, Micro Four Thirds, and other APS-C mounts depending on version.