Samyang's manual-focus APS-C fisheye — 180-degree diagonal coverage at f/3.5 for creative and fun photography.
The Samyang 8mm f/3.5 UMC CS II is a manual-focus diagonal fisheye lens designed for APS-C sensor cameras. It provides approximately 180 degrees of diagonal coverage with the extreme barrel distortion characteristic of fisheye optics — popular for creative, skateboarding, and real estate work.
Optically good for a fisheye — sharp in the centre with the expected fisheye distortion and curvature. UMC (Ultra Multi Coated) reduces flare and ghosting. Manual focus only with a well-damped focus ring. Fixed f/3.5 to f/22 aperture range via manual aperture ring.
Available in Canon EF-S, Nikon F DX, Sony A, and other APS-C mounts. Bulbous front element — a built-in petal hood provides some protection but no filter thread. Weighs approximately 435g. CS designation means APS-C coverage. Removable hood on some versions.
Very cheap used. Also sold as Rokinon and Bower branded versions. No autofocus — manual focus only, but fisheye lenses have enormous depth of field so precise focusing is rarely critical. A fun creative lens and useful for virtual tour/360 stitching work.