Samyang / Rokinon 21mm F1.4 ED AS UMC CS

Focal length: 21 mm
Aperture: f/1.4
Weight: 285 g
Filter diameter: 58 mm
Min. focus distance: 28 cm
Length: 66 mm

At a Glance

On Micro Four Thirds, the 21 mm becomes a standard prime with a 42 mm full-frame equivalent. The f/1.4 aperture allows short shutter times in low light and shallow depth of field. It weighs 285 g and is focused manually. Everyday, street and low-light shooting are its territory.

Good for

Everyday
Street
Low light

Worth knowing

No autofocus: focusing is manual only.

Derived from the manufacturer data, not from our own tests. How we check

Technical Specifications

Min. focal length: 21 mm
Max. focal length: 21 mm
Max. aperture (min. zoom): f/1.4
Max. aperture (max. zoom): f/1.4
Min. aperture: f/22
Elements: 8
Groups: 7
Weight: 285 g (0.63 lb)
Filter diameter: 58 mm
Min. focus distance: 28 cm (11.02 in)
Length: 66 mm (2.6 in)
Diameter: 64.3 mm (2.53 in)

Manufacturer data: samyanglens.com

Last checked: October 13, 2026 (against the manufacturer data) · How we check

Simulate depth of field and angle of view

Compare with other lenses

Which cameras does the Samyang / Rokinon 21mm F1.4 ED AS UMC CS fit?

The Samyang / Rokinon 21mm F1.4 ED AS UMC CS fits all Micro Four Thirds cameras. There its field of view equals 42 mm in full-frame terms (crop factor 2).

Micro Four Thirds cameras

Micro Four Thirds:: OM System PEN,OM System OM-3,OM System OM-5 Mark II,Panasonic Lumix G97 (G99M2),Panasonic Lumix GH7,OM System OM-1 Mark II,Panasonic Lumix G9 II,Panasonic Lumix G100D,OM System OM-5,OM System OM-1,Panasonic Lumix GH6,Panasonic Lumix GH5 II,Olympus PEN E-P7,Olympus OM-D E-M10 Mark IV,Olympus OM-D E-M1 Mark III,Panasonic Lumix G100 (G110),Panasonic Lumix BGH1,Olympus PEN E-PL10,Olympus OM-D E-M5 Mark III,Panasonic Lumix G95 (G90, G91),Olympus OM-D E-M1X,Panasonic Lumix GX9,Panasonic Lumix GF10 (GF90, GX880),Olympus PEN E-PL9,Panasonic Lumix GH5S,Blackmagic Pocket Cinema Camera 4K,Panasonic Lumix G9,Olympus OM-D E-M10 Mark III (Mark III S),Panasonic Lumix GF9 (GX850, GX800),Panasonic Lumix GH5,Olympus PEN E-PL8,Olympus OM-D E-M1 Mark II,Panasonic Lumix G85 (G80, G81),Panasonic Lumix GX85 (GX80, GX7 Mark II),Olympus PEN-F,Olympus OM-D E-M10 Mark II,Panasonic Lumix GX8,Panasonic Lumix G7,Panasonic Lumix GF7,Olympus Air A01,Olympus OM-D E-M5 Mark II,Panasonic Lumix GM5,Olympus PEN E-PL7,Panasonic Lumix GH4,Olympus OM-D E-M10,Panasonic Lumix GM1,Olympus OM-D E-M1,Panasonic Lumix GX7,Olympus PEN E-PL6,Olympus PEN E-P5,Panasonic Lumix G6,Panasonic Lumix GF6,Blackmagic Pocket Cinema Camera,Olympus PEN E-PM2,Olympus PEN E-PL5,Panasonic Lumix GH3,Panasonic Lumix G5,Panasonic Lumix GF5,Olympus OM-D E-M5,Blackmagic Cinema Camera (MFT),Panasonic Lumix GX1,Olympus PEN E-PM1,Olympus PEN E-PL3,Olympus PEN E-P3,Panasonic Lumix GF3,Panasonic Lumix G3,Olympus PEN E-PL2,Panasonic Lumix GF2,Panasonic Lumix GH2,Panasonic Lumix G2,Panasonic Lumix G10,Olympus PEN E-PL1 (E-PL1s),Olympus PEN E-P2,Panasonic Lumix GF1,Olympus PEN E-P1,Panasonic Lumix GH1,Panasonic Lumix G1