Sigma 40mm T1.3 LF Sony E-mount

Sigma 40mm T1.3 LF Sony E-mount. Brilliant at T1.3: forging new expressions. Here begins a new benchmark for filmmaking. Introducing the Aizu Prime Line – the world's first* lineup of large-format cinema lenses to achieve an aperture value of T1.3 across all focal lengths (*As of June 2025, by Sigma). The lineup combines modern sharpness with an organic and naturally soft look, bringing rich texture and depth to visuals. Boasting unparalleled brightness, refined expression, and reliable performance, the Aizu Prime Line embodies the proven technology and quality of "Made in Aizu, Japan" establishing the new standard. 

 

 

 

 

A CONSISTENT T1.3 ACROSS ALL FOCAL LENGTHS

 

The T1.3 aperture enables exceptionally shallow depth of field and graceful bokeh, seamlessly separating the subject while preserving a natural sense of depth and dimensionality. This refined visual language draws the viewer into the frame with a subtle yet powerful presence.

 

 
OPTICAL DESIGN FOR THE DEMANDS OF CINEMA

 

All lenses in the Aizu Prime lineup feature an optical system developed exclusively for cinema applications. While maintaining modern sharpness, they avoid rigid or harsh depictions—delivering a natural, organic look. They provide quiet elegance and depth to the image, with distortion and focus breathing carefully minimized to ensure visual consistency, even in dynamic scenes.

 

 
∅46.3mm IMAGE CIRCLE

 

The large ∅46.3mm image circle ensures full coverage not only for full-frame and Super 35 formats, but also for the latest large-format cameras such as the ARRI ALEXA LF Open Gate and VistaVision. This capability enables uncompromised filmmaking across a diverse range of projects.

 

 
HIGH-IMPACT CLOSE-UP EXPRESSION

 

The short minimum focusing distance enables striking close-up shots. By getting closer to the subject, the Aizu Prime lenses create visual tension and dramatic effects, adding impactful depth to the imagery.

 

 

 

 

 

COMPACT. PRECISE. RELIABLE.

A compact design that unleashes creativity. Despite being built for large-format coverage and featuring an ultra-fast T1.3 aperture, the Aizu Prime lenses remain remarkably lightweight. This rare balance of exceptional speed and mobility offers the flexibility and creative freedom demanded by modern productions—from dolly and Steadicam to gimbal and handheld operation.

 

 

PRECISE OPERATION AND DURABILITY

 

The Aizu Prime lenses offer precise control, exceptional durability, and ease of maintenance. Despite its compact housing, it delivers unwavering reliability in demanding shooting environments. Every mechanical detail—from the wide focus rotation angle to the equal-pitch aperture ring—embodies the engineering expertise cultivated through the Sigma High Speed Prime series.

 

 

FEATURES

 

- A consistent T1.3 across all focal lengths
- Optical design for the demands of cinema
- Huge perspective range coverage
- Completely consistent look
- ⌀46.3mm image circle
- High-impact close-up expression
- A compact design that unleashes creativity
- Precise operation and durability

 

 

SPECIFICATIONS

 

Lens mount: Sony E-mount

Focal Length: 40 mm

T-stop: T1.3 - T22

Number of Diaphragm Blades: 13
Close Focus: 0.38 m (close focus distance is measured from the image plane)

Maximum Magnification Ratio: 1:6.1

Image Circle: 46.3 mm

Front Diameter: 95 mm

Length: 162.8 mm

Weight: 1.7 kg

Angle Of View: LF Open Gate: 49.3°, Full Frame: 48.5°, Super 35: 34.6° (Horizontal angle of view for ARRI LF Open Gate mode aperture (aspect ratio 3:2, dimensions 36.70mm x 25.54mm); Horizontal angle of view for a full-frame cinema camera aperture (aspect ratio 1.5:1, dimensions 36mm x 24mm); Horizontal angle of view for an Super 35 cinema camera aperture (aspect ratio 1.33:1, dimensions 24.9mm x 18.7mm)

Focus Rotation: 270°

Iris Rotation: 70°

Lens Support Foot: SF-61

Metadata Compatibility: Compatible with Sony E-mount communication protocol. Enables transmission and recording of lens metadata to supported camera bodies.