Sigma Aizu Prime 25mm T1.3 LF

Ultra Fast Large Format Cinema Precision

The Aizu Prime 25mm T1.3 LF is part of Sigma’s groundbreaking Aizu Prime series, the world’s first lineup of large-format cinema lenses to achieve a constant T1.3 aperture across all focal lengths. Designed specifically for professional cinema production, the lens combines exceptional brightness, modern optical precision, and an organic cinematic rendering optimized for high-end digital filmmaking workflows.

Featuring a large image circle of 46.3mm, the Aizu Prime 25mm T1.3 LF fully supports large-format and full-frame cinema cameras while maintaining excellent edge-to-edge consistency. The focal length delivers a highly versatile wide-angle perspective ideal for narrative filmmaking, commercials, documentaries, music videos, and immersive cinematic environments.

The extremely fast T1.3 aperture allows filmmakers to create exceptionally shallow depth of field while maintaining natural dimensionality and smooth subject separation. The lens delivers refined bokeh characteristics and cinematic highlight rendering without sacrificing overall sharpness or image fidelity. Sigma engineered the optical system specifically for motion picture production, minimizing distortion and focus breathing to ensure visual consistency during complex camera movement and focus transitions.

Mechanically, the lens follows a professional cine-standard design philosophy with robust all-metal construction, precise focus resistance, and long-throw focus rotation for accurate manual operation. Standardized gear positioning and a uniform front diameter allow seamless integration into professional cinema rigs, follow focus systems, matte boxes, and remote production environments.

Despite its extremely bright aperture and large-format coverage, the lens remains remarkably compact and lightweight, supporting handheld, Steadicam, gimbal, crane, and drone workflows. The lens also supports Cooke /i Technology and ZEISS eXtended Data for advanced metadata workflows in VFX and virtual production environments.

Features – Aizu Prime 25mm T1.3 LF

• Constant ultra-fast T1.3 aperture
• Large-format full-frame cinema coverage
• 46.3mm image circle
• Designed exclusively for cinema applications
• Organic cinematic rendering characteristics
• Modern sharpness with natural softness
• Controlled focus breathing
• Minimal geometric distortion
• Smooth cinematic bokeh rendering
• Excellent low-light performance
• Standardized cine mechanics
• Long 270° focus rotation
• Compact lightweight housing design
• Full metal cine construction
• Compatible with Cooke /i Technology
• Supports ZEISS eXtended Data
• Optimized for 6K–8K cinema workflows
• High durability for professional production use

Mounts

• PL Mount
• Sony E-Mount

Technical Specifications

• Lens type: Large Format Cinema Prime Lens
• Focal length: 25mm
• Aperture range: T1.3 – T22
• Image circle: 46.3mm
• Iris blades: 13-blade diaphragm
• Minimum focus distance: 0.31m / 1'0"
• Maximum magnification ratio: 1:6.5
• Front diameter: 95mm
• Focus rotation: 270°
• Iris rotation: 70°
• Gear standard: 0.8 MOD
• Metadata support: Cooke /i + ZEISS eXtended Data
• Lens support foot: SF-61
• Optimized for large-format cinema cameras
• Compatible with professional cine accessories

Dimensions & Weight

• Length (PL Mount): 125mm / 5"
• Length (Sony E-Mount): 159mm / 6.3"
• Weight (PL Mount): 1.7kg / 3.6lb
• Weight (Sony E-Mount): 1.7kg / 3.7lb