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 wide-angle prime for APS-C cameras, providing 24mm equivalent at f/2. It targets astrophotographers and landscape shooters wanting a fast wide-angle at a budget price.
Optically good — sharp from f/4 with decent performance at f/2. ED glass controls chromatic aberration. UMC coating reduces flare. The f/2 aperture makes it useful for night sky photography where maximum light gathering matters. Manual focus with smooth ring.
Available for multiple APS-C mounts. 77mm filter thread — large but accepts standard filters. Approximately 570g — heavy for an APS-C wide. No electronic contacts on most versions. APS-C coverage. Also sold as Rokinon 16mm f/2.
Available used at budget prices. The 77mm filter thread that accepts standard filters is an advantage over bulbous ultra-wides. The Samyang 12mm f/2 is wider and lighter for mirrorless. For DSLR astrophotographers wanting a fast wide-angle with standard filter capability.