Sirui Swift 20mm F2.4

Focal length: 20 mm
Aperture: f/2.4
Weight: 212 g
Filter diameter: 58 mm
Min. focus distance: 20 cm
Length: 60.3 mm

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At a Glance

The Sirui Swift 20mm F2.4 is an ultra-wide prime for full frame (L-Mount). It covers 20 mm at f/2.4. It has autofocus and weighs 212 g. Minimum focus distance is 20 cm, maximum magnification 1:7.35.

Good for

Landscape
Architecture
Interiors
Travel

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/2.4
Max. aperture (max. zoom): f/2.4
Min. aperture: f/16
Elements: 11
Groups: 9
Weight: 212 g (0.47 lb)
Filter diameter: 58 mm
Min. focus distance: 20 cm (7.87 in)
Max. magnification: 1:7.4 (0.14×)
Length: 60.3 mm (2.37 in)
Diameter: 69.5 mm (2.74 in)
Announced: October 2026

Manufacturer data: store.sirui.com

Last checked: October 29, 2026 (against the manufacturer data) · How we check

Simulate depth of field and angle of view

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Which cameras does the Sirui Swift 20mm F2.4 fit?

The Sirui Swift 20mm F2.4 is a full-frame lens for L-Mount cameras. On full-frame bodies it uses the whole sensor; on APS-C L-Mount cameras its field of view equals 30 mm in full-frame terms.

L-Mount cameras

Full frame:: Sigma FP2, Leica SL3-P, Leica SL3-S, Sigma BF, Panasonic Lumix S1II, Panasonic Lumix S1IIE, Panasonic Lumix S1RII, Leica SL3, Panasonic Lumix S9, Blackmagic PYXIS 6K, Panasonic Lumix S5II, Panasonic Lumix S5IIX, Blackmagic Cinema Camera 6K, Panasonic Lumix BS1H, Leica SL2-S, Panasonic Lumix S5, Sigma fp L, Leica SL2, Panasonic Lumix S1, Panasonic Lumix S1R, Panasonic Lumix S1H, Sigma fp, Leica SL (Typ 601)
APS-C:: Leica CL, Leica TL2, Leica TL, Leica T (Typ 701)