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Samyang / Rokinon 20mm F1.8 ED AS UMC

Canon EF

Samyang / Rokinon 20mm F1.8 ED AS UMC

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

This 20 mm ultra-wide prime covers Canon EF full-frame cameras. Its f/1.8 maximum aperture gathers a lot of light, and it focuses as close as 20 cm. Aspherical and ED elements are part of the optical design. Focusing is entirely manual. The wide view suits landscapes, architecture, interiors and night sky work.

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
497 g (1.1 lb)
Filter diameter
77 mm
Min. focus distance
20 cm (7.87 in)
Length
88.4 mm (3.48 in)
Diameter
83 mm (3.27 in)

Manufacturer data: rokinon.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 20mm F1.8 ED AS UMC fit?

The Samyang / Rokinon 20mm F1.8 ED AS UMC is a full-frame lens for Canon EF cameras. On full-frame bodies it uses the whole sensor; on APS-C Canon EF cameras its field of view equals 32 mm in full-frame terms.

Canon EF cameras

Full frame:
Canon EOS-1D X Mark III,Canon EOS 6D Mark II,Canon EOS-1D X Mark II,Canon EOS 5D Mark IV,Canon EOS 5Ds,Canon EOS 5Ds R,Canon EOS 5D Mark III,Canon EOS 6D,Canon EOS-1D C,Canon EOS-1D X,Canon EOS 5D Mark II
APS-C:
Canon EOS 850D (Rebel T8i),Canon EOS 90D,Canon EOS 250D (Rebel SL3),Canon EOS 4000D (3000D, Rebel T100),Canon EOS 2000D (1500D, Rebel T7),Canon EOS 800D (Rebel T7i),Canon EOS 77D,Canon EOS 200D (Rebel SL2),Canon EOS 80D,Canon EOS 1300D (Rebel T6),Canon EOS 750D (Rebel T6i),Canon EOS 760D (Rebel T6s),Canon EOS 7D Mark II,Canon EOS 1200D (Rebel T5),Canon EOS 70D,Canon EOS 700D (Rebel T5i),Canon EOS 100D (Rebel SL1),Canon EOS 650D (Rebel T4i),Canon EOS 60Da,Canon EOS 600D (Rebel T3i),Canon EOS 1100D (Rebel T3),Canon EOS 550D (Rebel T2i),Canon EOS 60D,Canon EOS 7D,Canon EOS 500D (Rebel T1i),Canon EOS 50D,Canon EOS 450D (Rebel XSi),Canon EOS 1000D (Rebel XS)

With the Canon Mount Adapter EF-EOS R the lens can also be used on Canon RF cameras.

With the Canon Mount Adapter EF-EOS M the lens can also be used on Canon EF-M cameras.

Samyang / Rokinon 20mm F1.8 ED AS UMC compared

Key specs side by side with the most similar Canon EF lenses.

LensSamyang / Rokinon 20mm F1.8 ED AS UMCSigma 20mm F1.8 EX DG Aspherical RFVenus Laowa Aksen 17.5mm F1.7 5-10X Ultra Macro APOZeiss Distagon T* 2,8/21
Focal length20 mm20 mm17.5 mm21 mm
Max. aperturef/1.8f/1.8f/1.7f/2.8
Weight497 g520 g570 g600 g
Filter diameter77 mm82 mm–82 mm
Min. focus distance20 cm20 cm–22 cm
Length88.4 mm89.5 mm127.5 mm109 mm
Autofocusnoyesnono
Image stabilizationnononono
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Samyang / Rokinon 20mm F1.8 ED AS UMC: FAQ

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

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

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

No, the Samyang / Rokinon 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 / Rokinon 20mm F1.8 ED AS UMC weigh?

The Samyang / Rokinon 20mm F1.8 ED AS UMC weighs 497 g. It is 88.4 mm long with a diameter of 83 mm.

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

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

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

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

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

Yes, the Samyang / Rokinon 20mm F1.8 ED AS UMC covers full frame. On APS-C cameras its field of view equals 32 mm in full-frame terms.

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