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Samyang 20mm F1.8 ED AS UMC

Sony E

Samyang 20mm F1.8 ED AS UMC

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

At 20 mm on full frame, this Sony E lens gives a very wide field of view. The f/1.8 aperture is large for an ultra-wide and helps with night sky and interiors. Focusing is manual. The minimum focus distance is 20 cm. Beyond night sky it suits landscape, architecture and interiors. It weighs 525 g.

Good for

  • Landscape
  • Architecture
  • Interiors
  • Night sky

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
525 g (1.16 lb)
Filter diameter
77 mm
Min. focus distance
20 cm (7.87 in)
Length
114.4 mm (4.5 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 is a full-frame lens for Sony E-Mount cameras. On full-frame bodies it uses the whole sensor; on APS-C Sony E-Mount cameras its field of view equals 30 mm in full-frame terms.

Sony E-Mount cameras

Full frame:
Sony A7R VI,Sony A7 V,Sony FX2,Sony A1 II,Sony A9 III,Sony A7C II,Sony A7CR,Sony ZV-E1,Sony A7R V,Sony A7 IV,Sony A1,Sony FX3,Sony A7S III,Sony A7C,Sony FX6,Sony A7R IV (A7R IVA),Sony A9 II,Sony FX9,Sony A7 III,Sony A7R III (A7R IIIA),Sony A9,Sony A7R II,Sony A7S II,Sony A7 II,Sony A7S,Sony A7,Sony A7R
APS-C:
Sony ZV-E10 II,Sony A6700,Sony FX30,Sony ZV-E10,Sony A6600,Sony A6100,Sony A6400,Sony A6500,Sony A6300,Sony QX1 (ILCE-QX1),Sony A6000,Sony A5100,Sony A3500,Sony A5000,Sony A3000,Sony NEX-5T,Sony NEX-3N,Sony NEX-6,Sony NEX-5R,Sony NEX-F3,Sony NEX-7,Sony NEX-5N,Sony NEX-C3,Sony NEX-5,Sony NEX-3

Samyang 20mm F1.8 ED AS UMC compared

Key specs side by side with the most similar Sony E-Mount lenses.

LensSamyang 20mm F1.8 ED AS UMCViltrox MF 20mm F1.8Tokina Firin 20mm F2 FE MFSony FE 20mm F1.8G
Focal length20 mm20 mm20 mm20 mm
Max. aperturef/1.8f/1.8f/2f/1.8
Weight525 g775 g490 g373 g
Filter diameter77 mm82 mm62 mm67 mm
Min. focus distance20 cm25 cm28 cm18 cm
Length114.4 mm102 mm82 mm84.7 mm
Autofocusnononoyes
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 525 g. It is 114.4 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.

Is the Samyang 20mm F1.8 ED AS UMC a full-frame lens?

Yes, the Samyang 20mm F1.8 ED AS UMC covers full frame. On APS-C cameras its field of view equals 30 mm in full-frame terms.

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