Sigma Aizu Prime 40mm T1.3 LF

Cinematic Large Format Prime Lens

The Aizu Prime 40mm T1.3 LF expands Sigma’s next-generation Aizu Prime lineup with a focal length that delivers a highly natural cinematic perspective combined with exceptional optical speed and large-format coverage. As part of the world’s first full large-format cinema lens series with a constant T1.3 aperture across all focal lengths, the lens establishes a new benchmark for modern cinema production workflows.

The 40mm focal length is widely regarded as one of the most versatile perspectives in cinematography, positioned between the classic 35mm and 50mm visual language. It delivers a natural field of view with strong subject separation while maintaining environmental context, making it particularly effective for narrative filmmaking, commercials, handheld cinematography, documentary production, and dialogue scenes.

Optically, the lens combines extremely high resolving power with an organic cinematic rendering profile designed specifically for motion picture production. Images maintain exceptional detail and contrast while preserving natural highlight transitions, refined skin tones, and smooth out-of-focus rendering. The result is a cinematic image with depth and dimensionality that integrates naturally into modern digital cinema workflows.

The constant T1.3 aperture enables filmmakers to achieve exceptionally shallow depth of field and outstanding low-light performance. Subjects separate naturally from the background while maintaining smooth and cinematic focus falloff. Sigma’s cinema-focused optical design minimizes focus breathing and geometric distortion to preserve compositional consistency during focus pulls and camera movement.

Mechanically, the Aizu Prime 40mm T1.3 LF features a robust full-metal cine housing with standardized gear positioning, long 270° focus rotation, and consistent front dimensions across the lineup. This allows seamless integration with professional cinema accessories including matte boxes, follow focus systems, remote motors, and rigging configurations.

Despite its ultra-fast aperture and large-format image coverage, the lens remains compact and lightweight, making it suitable for handheld, Steadicam, crane, drone, and gimbal workflows. Support for Cooke /i Technology and ZEISS eXtended Data further enhances compatibility with advanced VFX, virtual production, and post-production pipelines.

Features – Aizu Prime 40mm T1.3 LF

• Constant ultra-fast T1.3 aperture
• Large-format full-frame image coverage
• Natural cinematic 40mm perspective
• Organic rendering with modern sharpness
• Excellent low-light performance
• Cinematic shallow depth of field
• Smooth highlight roll-off characteristics
• Controlled focus breathing
• Minimal geometric distortion
• Refined cinematic bokeh rendering
• 46.3mm image circle
• Standardized cine mechanics
• Long 270° focus rotation
• Compact lightweight cine housing
• Full metal professional construction
• Compatible with Cooke /i Technology
• Supports ZEISS eXtended Data
• Optimized for professional cinema workflows

Mounts

• PL Mount
• Sony E-Mount

Technical Specifications

• Lens type: Large Format Cinema Prime Lens
• Focal length: 40mm
• Aperture range: T1.3 – T22
• Image circle: 46.3mm
• Iris blades: 13-blade diaphragm
• Minimum focus distance: 0.45m / 1'6"
• Front diameter: 95mm
• Focus rotation: 270°
• Iris rotation: 70°
• Gear standard: 0.8 MOD
• Metadata support: Cooke /i + ZEISS eXtended Data
• Housing: Full metal cine construction
• Compatible with professional cine accessories
• Designed for large-format cinema cameras
• Optimized for 6K–8K production workflows

Dimensions & Weight

• Length (PL Mount): approx. 125mm / 5"
• Length (Sony E-Mount): approx. 159mm / 6.3"
• Weight (PL Mount): approx. 1.7kg / 3.7lb
• Weight (Sony E-Mount): approx. 1.8kg / 3.9lb