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Samyang / Rokinon 20mm F1.8 ED AS UMC

Nikon F (DX/FX)

Samyang / Rokinon 20mm F1.8 ED AS UMC

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

The Samyang / Rokinon 20mm F1.8 ED AS UMC is a manual-focus ultra-wide prime for Nikon F-mount full-frame cameras. Its f/1.8 maximum aperture allows shorter shutter times in dim light. It focuses down to 20 cm and uses aspherical and ED elements with an ultra multi coating. The wide field of view suits landscapes, architecture, interiors and night sky.

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
488 g (1.08 lb)
Filter diameter
77 mm
Min. focus distance
20 cm (7.87 in)
Length
85.9 mm (3.38 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 Nikon F-Mount cameras. On full-frame bodies it uses the whole sensor; on APS-C Nikon F-Mount cameras its field of view equals 30 mm in full-frame terms.

Nikon F-Mount cameras

Full frame:
Nikon D6,Nikon D780,Nikon D850,Nikon D5,Nikon D810A,Nikon D4S,Nikon D810,Nikon D750,Nikon Df,Nikon D610,Nikon D4,Nikon D800,Nikon D800E,Nikon D600,Nikon D3S,Nikon D3X,Nikon D700
APS-C:
Nikon D3500,Nikon D7500,Nikon D500,Nikon D3400,Nikon D5600,Nikon D5500,Nikon D7200,Nikon D3300,Nikon D7100,Nikon D5300,Nikon D3200,Nikon D5200,Nikon D5100,Nikon D7000,Nikon D3100,Nikon D300S,Nikon D5000,Nikon D3000,Nikon D90,Nikon D60

With the Nikon FTZ II / FTZ the lens can also be used on Nikon Z (DX/FX) cameras.

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

Key specs side by side with the most similar Nikon F-Mount lenses.

LensSamyang / Rokinon 20mm F1.8 ED AS UMCNikon AF-S Nikkor 20mm f/1.8G EDSigma 20mm F1.8 EX DG Aspherical RFVenus Laowa Aksen 17.5mm F1.7 5-10X Ultra Macro APO
Focal length20 mm20 mm20 mm17.5 mm
Max. aperturef/1.8f/1.8f/1.8f/1.7
Weight488 g355 g520 g570 g
Filter diameter77 mm77 mm82 mm–
Min. focus distance20 cm20 cm20 cm–
Length85.9 mm80.5 mm89.5 mm127.5 mm
Autofocusnoyesyesno
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 488 g. It is 85.9 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 30 mm in full-frame terms.

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