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Samyang 20mm F1.8 ED AS UMC

Micro Four Thirds (MFT/M43)

Samyang 20mm F1.8 ED AS UMC

Focal length
20 mm
Aperture
f/1.8
Weight
520 g
Filter diameter
77 mm
Min. focus distance
20 cm
Length
113.2 mm
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At a Glance

On Micro Four Thirds, the 20 mm focal length becomes a 40 mm full-frame equivalent, a moderate wide angle close to a standard view. The f/1.8 aperture gathers plenty of light, and focusing is manual. The minimum focus distance is 20 cm. It suits street, reportage and everyday shooting. The lens weighs 520 g.

Good for

  • Street
  • Reportage
  • Everyday

Worth knowing

  • No autofocus: focusing is manual only.

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

Technical Specifications

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Min. focal length
20 mm
Max. focal length
20 mm
Max. aperture (min. zoom)
f/1.8
Max. aperture (max. zoom)
f/1.8
Min. aperture
f/22
Elements
13
Groups
12
Weight
520 g (1.15 lb)
Filter diameter
77 mm
Min. focus distance
20 cm (7.87 in)
Length
113.2 mm (4.46 in)
Diameter
83 mm (3.27 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 20mm F1.8 ED AS UMC fit?

The Samyang 20mm F1.8 ED AS UMC fits all Micro Four Thirds cameras. There its field of view equals 40 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

Samyang 20mm F1.8 ED AS UMC compared

Key specs side by side with the most similar Micro Four Thirds lenses.

LensSamyang 20mm F1.8 ED AS UMCSamyang / Rokinon 21mm F1.4 ED AS UMC CSPanasonic Lumix G 20mm F1.7 ASPHPanasonic Lumix G 20mm F1.7 II ASPH
Focal length20 mm21 mm20 mm20 mm
Max. aperturef/1.8f/1.4f/1.7f/1.7
Weight520 g285 g100 g87 g
Filter diameter77 mm58 mm46 mm46 mm
Min. focus distance20 cm28 cm20 cm20 cm
Length113.2 mm66 mm25.5 mm25.5 mm
Autofocusnonoyesyes
Image stabilizationnononono
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Samyang 20mm F1.8 ED AS UMC: FAQ

Does the Samyang 20mm F1.8 ED AS UMC have autofocus?

No, the Samyang 20mm F1.8 ED AS UMC has no autofocus; you focus it manually.

Does the Samyang 20mm F1.8 ED AS UMC have image stabilization?

No, the Samyang 20mm F1.8 ED AS UMC has no stabilization of its own. On cameras with in-body image stabilization (IBIS) the image is still stabilized.

How much does the Samyang 20mm F1.8 ED AS UMC weigh?

The Samyang 20mm F1.8 ED AS UMC weighs 520 g. It is 113.2 mm long with a diameter of 83 mm.

What filter size does the Samyang 20mm F1.8 ED AS UMC use?

The Samyang 20mm F1.8 ED AS UMC takes 77 mm screw-in filters.

How close can the Samyang 20mm F1.8 ED AS UMC focus?

The minimum focus distance of the Samyang 20mm F1.8 ED AS UMC is 20 cm, measured from the sensor plane.

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