Samyang 20mm F1.8 ED AS UMC

Focal length: 20 mm
Aperture: f/1.8
Weight: 565 g
Filter diameter: 77 mm
Min. focus distance: 20 cm
Length: 114.7 mm

At a Glance

This is a full-frame design used on Fujifilm X cameras with an APS-C sensor. The 20 mm focal length becomes a 30 mm full-frame equivalent, a wide angle. The f/1.8 aperture allows shooting in low light, such as the night sky. Focusing is manual, and the minimum focus distance is 20 cm. It suits landscape and reportage and weighs 565 g.

Good for

Landscape
Reportage
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

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: 565 g (1.25 lb)
Filter diameter: 77 mm
Min. focus distance: 20 cm (7.87 in)
Length: 114.7 mm (4.52 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 Fujifilm X-Mount cameras. There its field of view equals 30 mm in full-frame terms (crop factor 1.5).

Fujifilm X-Mount cameras

APS-C:: Fujifilm X-T30 III,Fujifilm X-E5,Fujifilm X-M5,Fujifilm X-T50,Fujifilm X-S20,Fujifilm X-T5,Fujifilm X-H2,Fujifilm X-H2S,Fujifilm X-T30 II,Fujifilm X-E4,Fujifilm X-S10,Fujifilm X-T4,Fujifilm X-T200,Fujifilm X-Pro3,Fujifilm X-A7,Fujifilm X-T30,Fujifilm X-T3,Fujifilm X-T100,Fujifilm X-H1,Fujifilm X-A5,Fujifilm X-E3,Fujifilm X-T20,Fujifilm X-A10,Fujifilm X-A3,Fujifilm X-T2,Fujifilm X-E2S,Fujifilm X-Pro2,Fujifilm X-T1 IR,Fujifilm X-T10,Fujifilm X-A2,Fujifilm X-T1,Fujifilm X-E2,Fujifilm X-A1,Fujifilm X-M1,Fujifilm X-E1,Fujifilm X-Pro1