Samyang's manual wide-angle for APS-C — 24mm equiv at f/2 for astrophotography and landscapes.
The Samyang 16mm f/2.0 ED AS UMC CS is a manual-focus ultra-wide prime for Micro Four Thirds, covering approximately 32mm full-frame equivalent. Thirteen elements in 11 groups including ED and aspherical elements. Eight aperture blades. 77mm filter thread. 0.20m MFD. Manual focus only.
Thirteen elements in 11 groups (1 ED + 2 aspherical elements). Eight aperture blades. The 77mm filter thread. Minimum focus distance of 0.20m. Manual focus only — no AF version. f/2.0 maximum aperture. APS-C coverage (CS = Crop Sensor; covers MFT sensor fully despite CS designation). Micro Four Thirds mount.
The CS (Crop Sensor) designation indicates the lens is designed for APS-C-sized sensors but the image circle covers the smaller Micro Four Thirds sensor. At 16mm on MFT (2× crop factor), the equivalent perspective is 32mm — a moderate wide-angle. The 0.20m MFD enables close foreground environmental compositions at the wide angle.
On the used market the Samyang 16mm f/2.0 ED AS UMC CS is affordable as a manual-focus MFT wide prime. Condition checks: focus helicoid smoothness, 77mm front element for marks. Manual focus only. Compatible with all Micro Four Thirds bodies.