Sigma Aizu Prime 21mm T1.3 - Lens review and specs

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PL Mount Sony E Cinema full-frame 2026

Useful links

Official Website

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21mm

Focal length

f/1.3

Max aperture

1600 g

Weight

14mm35mm85mm200mm600mm

▲ 21mm

Max aperture

f/1.4

f/1.3

f/2

Constant Aperture

Zoom Ratio: 1x

Aperturef/1.3

f/1.3f/22

Near focus3' 5"

Far focus4' 1"

Total DOF9"

Hyperfocal38' 8"

Subject distance3' 9"

Focal length21 mm

Aperturef/1.3

SensorFull Frame

Illustrative scene preview based on this lens's focal length, aperture, and sensor coverage.

This preview uses 21mm, f/1.3, and Full Frame. Subject distance is estimated to keep lens previews comparable.

Min aperture: f/22
Diaphragm blades: 13

Optics

Special elements: High-performance cine optical elements
Coatings: Multi-layer cinema coating

Focusing

Minimum focus: 35 cm

Physical

Weight: 1600 g
Dimensions: ⌀95mm × 120mm
Color: Black

Handling & Controls

Distance Scale: Yes

Recommended Use

Ideal for: Architecture, astro, Landscapes, Portraits, Vlogging, Weddings

Release year: 2026
Announced: Sep 9, 2026
Approx price: $9799 USD

The best

Ultrafast T1.3 large-format wide cinema prime engineered for high-end film and television cinematography.

Also

Large φ46.3mm image circle covering Full Frame and ALEXA LF with Cooke /i and ZEISS eXtended Data support.

Summary

The Sigma Aizu Prime 21mm T1.3 is an ultrafast large-format cinema prime lens designed for high-end motion picture production, commercial filmmaking, and narrative cinematography. Crafted by Sigma at its renowned facility in Aizu, Japan, this 21mm wide-angle cine prime delivers a breakthrough combination of an ultrafast T1.3 maximum aperture and a generous φ46.3mm image circle that fully covers Full Frame, VistaVision, and ARRI ALEXA LF Open Gate sensor formats.

Optically engineered specifically for cinematic storytelling, the Aizu Prime series achieves an exquisite balance of modern high-resolution clarity and a gentle, organic texture that flatters human skin tones while preventing harsh digital sharpness. Its 13-blade rounded iris produces creamy, circular bokeh and beautiful out-of-focus roll-off, while internal optical corrections rigorously eliminate focus breathing and geometric distortion during complex camera moves.

Built to withstand demanding set environments, the robust chassis features standardized 0.8 MOD gears, smooth 270-degree focus rotation for millimeter-precise focus pulling, and luminous barrel markings for low-light operation. Available in ARRI PL and Sony E mounts, the PL version integrates advanced Cooke /i Technology and ZEISS eXtended Data protocols, streaming real-time lens distortion and shading metadata directly into high-end VFX and virtual production pipelines.

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Where to buy

Amazon USAView offers B&H PhotoView product

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Pros & Cons

Pros

Consistent ultrafast T1.3 maximum aperture across large-format sensors
Full-frame and large-format coverage with a generous φ46.3mm image circle
Virtually zero focus breathing with an organic, nuanced rendering style
Standardized 0.8 MOD gearing and 270-degree focus rotation for follow-focus precision
Comprehensive metadata support via Cooke /i Technology and ZEISS eXtended Data

Cons

Dedicated manual-focus cine build without autofocus capabilities
Substantial professional weight at 1.6 kg with 95mm front diameter
High-end commercial cinema price point designed for rental and production houses
No in-lens optical stabilization