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Samyang / Rokinon 21mm F1.4 ED AS UMC CS

Sony E

Samyang / Rokinon 21mm F1.4 ED AS UMC CS

Focal length
21 mm
Aperture
f/1.4
Weight
275 g
Filter diameter
58 mm
Min. focus distance
28 cm
Length
67.6 mm
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At a Glance

Made for APS-C on Sony E-Mount, this 21 mm lens reaches a 32 mm full-frame equivalent. It opens to f/1.4, weighs 275 g and has no autofocus. With a 28 cm minimum focus distance, it fits street, reportage and everyday photography.

Good for

  • Street
  • Reportage
  • Everyday

Worth knowing

  • APS-C image circle: on full-frame cameras only usable in crop mode, at reduced resolution.
  • 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
21 mm
Max. focal length
21 mm
Max. aperture (min. zoom)
f/1.4
Max. aperture (max. zoom)
f/1.4
Min. aperture
f/22
Elements
8
Groups
7
Weight
275 g (0.61 lb)
Filter diameter
58 mm
Min. focus distance
28 cm (11.02 in)
Length
67.6 mm (2.66 in)
Diameter
64.3 mm (2.53 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 / Rokinon 21mm F1.4 ED AS UMC CS fit?

The Samyang / Rokinon 21mm F1.4 ED AS UMC CS is designed for APS-C sensors. On APS-C Sony E-Mount cameras its field of view equals 32 mm in full-frame terms. Full-frame bodies use it in APS-C (crop) mode, recording only part of the sensor and fewer megapixels.

Sony E-Mount cameras

Full frame (in APS-C mode):
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 / Rokinon 21mm F1.4 ED AS UMC CS compared

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

LensSamyang / Rokinon 21mm F1.4 ED AS UMC CSSigma 23mm F1.4 DC DN | CTokina atx-m 23mm F1.4Viltrox AF 23mm F/1.4
Focal length21 mm23 mm23 mm23 mm
Max. aperturef/1.4f/1.4f/1.4f/1.4
Weight275 g330 g276 g260 g
Filter diameter58 mm52 mm52 mm52 mm
Min. focus distance28 cm25 cm30 cm30 cm
Length67.6 mm78.9 mm72 mm72 mm
Autofocusnoyesyesyes
Image stabilizationnononono
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Samyang / Rokinon 21mm F1.4 ED AS UMC CS: FAQ

Does the Samyang / Rokinon 21mm F1.4 ED AS UMC CS have autofocus?

No, the Samyang / Rokinon 21mm F1.4 ED AS UMC CS has no autofocus; you focus it manually.

Does the Samyang / Rokinon 21mm F1.4 ED AS UMC CS have image stabilization?

No, the Samyang / Rokinon 21mm F1.4 ED AS UMC CS 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 21mm F1.4 ED AS UMC CS weigh?

The Samyang / Rokinon 21mm F1.4 ED AS UMC CS weighs 275 g. It is 67.6 mm long with a diameter of 64.3 mm.

What filter size does the Samyang / Rokinon 21mm F1.4 ED AS UMC CS use?

The Samyang / Rokinon 21mm F1.4 ED AS UMC CS takes 58 mm screw-in filters.

How close can the Samyang / Rokinon 21mm F1.4 ED AS UMC CS focus?

The minimum focus distance of the Samyang / Rokinon 21mm F1.4 ED AS UMC CS is 28 cm, measured from the sensor plane.

Is the Samyang / Rokinon 21mm F1.4 ED AS UMC CS a full-frame lens?

No, the Samyang / Rokinon 21mm F1.4 ED AS UMC CS is an APS-C lens. On APS-C cameras its field of view equals 32 mm in full-frame terms.

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