South Korean manufacturer Samyang (also badged Rokinon) manufactures several autofocus lenses for Sony E-mount cameras, plus a couple for Canon and Nikon DSLRs. However, it’s most widely known for its extensive collection of manual-focus lenses, available in a diverse range of mount options. This 12mm diagonal fisheye lens is full-frame compatible but comes in a range of both full-frame and crop-sensor mount options, including Canon EF, Nikon F, Pentax K, Sony A, Canon M, Fujifilm X, Samsung NX, Sony E and Micro Four Thirds.
Mount: Canon EF, Nikon F, Pentax K, Sony A, Canon M, Fujifilm X, Samsung NX, Sony E, MFT
Full frame: Yes
Lens construction: 12 elements in 8 groups
Angle of view: 180 degrees (full-frame)
Diaphragm blades: 7
Minimum aperture: f/22
Minimum focusing distance: 0.2m
Maximum magnification ratio: Unspecified
Filter size: None
Dimensions: 77x70-99mm (mount dependent)
Weight: 500-565g (mount dependent)
As with most other Samyang manual-focus lenses, only the Nikon-mount edition has built-in electronics to enable camera-driven aperture control and the illumination of focus assist/confirmation lamps. Program AE and shutter-priority shooting modes are therefore only possible with Nikon cameras. With other makes of camera, you need not only to focus manually, but also to adjust the aperture manually via the rear-mounted aperture control ring. A drawback for DSLRs is that the viewfinder image becomes relatively dark when using narrow apertures.
The 12 optical elements include two aspherical and three ED (Extra-low Dispersion) elements. Nano-structure coatings are applied to keep ghosting and flare to a minimum. Given the huge depth of field when shooting with a fisheye lens, the lack of autofocus isn’t a major drawback. An upside is that the focus ring has a relatively long rotational travel, plus depth of field markers for f/2.8, f/4, f/5.6 and f/8. This enables ‘zone focusing’, so you can set the ‘in-focus’ range using the focus distance scale and DOF markers.
Sharpness is impressive across the whole image frame and the lens does well to keep color fringing to very low levels. The application of Samyang’s NCS (Nano Coating System) is effective in reducing ghosting and flare, the lens performing much better than its sibling 8mm f/3.5 UMC Fish-Eye CS II in this respect.
We usually run a range of lab tests under controlled conditions, using the Imatest Master testing suite. Photos of test charts are taken across the range of apertures and zooms (where available), then analyzed for sharpness, distortion and chromatic aberrations.
However, due to the relatively small size of test charts and the enormous 180-degree viewing angle of fisheye lenses, it’s impossible for us to generate meaningful lab-test data for them.
A full-frame diagonal fisheye lens that’s available in a wide variety of mount options, the Samyang delivers very good image quality with impressive sharpness, minimal color fringing and impressive resistance to ghosting and flare. It’s a fully manual lens in most cases, only the Nikon F mount version enabling aperture control from the camera body, and thus the full range of PASM shooting modes. The lack of autofocus isn’t a big deal, due to the typically enormous depth of field of fisheye lenses.