Sirui Swift 20mm and 40mm: specs, price, release

Sirui has launched the Swift series, kicking off with 20mm f/2.4 and 40mm f/2.2 autofocus primes for Sony E, L-mount, and Fujifilm X. Both cost $149.

Sirui’s new Swift series starts with two small full-frame autofocus primes, the 20mm f/2.4 and the 40mm f/2.2, each priced at $149.

Both are available for Sony E and L-mount cameras, and for Fujifilm X, where the full-frame coverage translates to roughly 30mm and 60mm equivalents on APS-C bodies.

Swift specs, optics, and controls

The two lenses share a maximum diameter of around 69.5 mm (2.74 in), a 58 mm filter thread, and a nine-blade aperture. Length runs from 60 to 62.3 mm (2.36 to 2.45 in) and weight from 207 to 215 g (7.3 to 7.6 oz), depending on lens and mount.

Focus is driven by an STM motor, and both lenses have an AF/MF switch, a customizable Fn button, and a clicked aperture ring. And while the last is definitely in the minus column for video shooters, on the plus side Sirui pitches the pair as having low distortion and minimal focus breathing.

The 20mm f/2.4 uses 11 elements in 9 groups, including two aspherical, two ED, and two HRI elements, and focuses down to 0.2 m (7.9 in). The 40mm f/2.2 uses 11 elements in 8 groups with one aspherical and two ED elements, and focuses to 0.4 m (1.31 ft). Sirui says both are all-glass designs.

Sirui also lists both lenses as weather-sealed, with a smudge-resistant coating on the front element. Camera compatibility info is here.

The obvious rivals are Viltrox's Air series, which also offers 20mm and 40mm primes at similar price and specs. The Swift's clicked aperture ring and weather sealing seem to be the main differences.

Pricing and availability

Pre-orders are open now through Sirui's store and Amazon, with shipping from November 6.