Sigma Aizu Prime 50mm T1.3 LF

Cinematic Large Format Prime

The Aizu Prime 50mm T1.3 LF represents the classic cinematic standard focal length within Sigma’s advanced Aizu Prime lineup. Combining a highly natural perspective with exceptional optical speed and large-format image coverage, the lens is designed for professional cinematographers seeking maximum creative flexibility and cinematic image quality.

As part of the world’s first large-format cinema lens lineup with a constant T1.3 aperture across all focal lengths, the Aizu Prime 50mm T1.3 LF establishes a new performance category for modern cinema optics. The lens delivers exceptional brightness while maintaining consistent rendering characteristics across the entire Aizu Prime family.

The 50mm focal length is widely considered one of the most universally applicable cinematic perspectives, closely matching natural human visual perception while still providing cinematic subject separation and spatial compression. This makes the lens highly suitable for narrative filmmaking, portrait cinematography, commercials, dialogue scenes, and documentary production.

Optically, the lens delivers a refined balance between high-resolution sharpness and organic cinematic rendering. Images maintain outstanding detail while preserving natural skin tones, smooth tonal transitions, and elegant highlight behavior. The rendering avoids the sterile appearance often associated with digital cinema optics and instead produces a cinematic image with depth and emotional texture.

The ultra-fast T1.3 aperture allows filmmakers to achieve extremely shallow depth of field while maintaining excellent low-light capability. Focus transitions remain smooth and cinematic, while Sigma’s advanced cinema optical design minimizes focus breathing and geometric distortion to preserve framing consistency during focus pulls and camera movement.

Mechanically, the lens features a robust full-metal housing engineered specifically for professional cinema environments. Standardized gear positioning, consistent front diameter, and long 270° focus rotation ensure seamless compatibility with follow focus systems, matte boxes, remote motors, and professional rigging configurations.

The lens also supports Cooke /i Technology and ZEISS eXtended Data, enabling advanced metadata workflows for VFX-heavy productions, virtual production environments, and post-production tracking systems.

Features – Aizu Prime 50mm T1.3 LF

• Constant ultra-fast T1.3 aperture
• Full-frame large-format image coverage
• Classic cinematic 50mm perspective
• Organic cinematic rendering characteristics
• Modern high-resolution optical performance
• Excellent low-light capability
• Cinematic shallow depth of field
• Smooth natural focus transitions
• Controlled focus breathing
• Minimal geometric distortion
• Refined cinematic bokeh rendering
• 46.3mm image circle
• Standardized cine mechanics
• Long 270° focus throw
• Compact lightweight cine housing
• Full metal construction
• Compatible with Cooke /i Technology
• Supports ZEISS eXtended Data

Mounts

• PL Mount
• Sony E-Mount

Technical Specifications

• Lens type: Large Format Cinema Prime Lens
• Focal length: 50mm
• 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
• Designed for professional cinema cameras
• Optimized for 6K–8K workflows
• Compatible with professional cine accessories

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