IB/E HDx35 Mark III Converter

The IB/E HDx35 Mark III is a high-end optical converter engineered to seamlessly adapt B4 mount 2/3” broadcast lenses for use on modern Super 35 large sensor cameras. Designed for demanding professional workflows, this converter enables cinematographers and broadcasters to continue leveraging high-performance HD ENG and box lenses in contemporary digital cinema environments.

At its core, the HDx35 Mark III addresses the fundamental optical mismatch between traditional three-chip prism-based B4 lenses and single-sensor large format cameras. Through precise spectral correction and a highly telecentric optical design, it ensures accurate color reproduction, consistent illumination, and edge-to-edge sharpness across the entire image field.

The Mark III generation expands image coverage and compatibility, making it suitable for a wider range of cameras including ARRI Alexa series, RED Epic systems, Sony CineAlta cameras, and more. With a magnification factor of 2.6x, it effectively adapts the image circle while maintaining strong optical integrity even at fast apertures.

A key differentiator is IB/E’s Universal Mount System (UMS), allowing flexible adaptation to multiple camera mounts such as PL, EF, E, F, FZ, and Micro Four Thirds. Mount changes can be performed in the field without re-shimming, significantly improving operational efficiency in dynamic production environments.

Handcrafted in Germany, the HDx35 Mark III reflects precision engineering and strict quality control standards. Its compact form factor, robust construction, and optimized coatings for flare reduction make it a reliable tool for high-end broadcast, live production, and cinema applications.

Features IB/E HDx35 Mark III

• Enables use of B4 2/3” broadcast lenses on Super 35 cameras
• Designed for HD ENG, DigiPrime and box lenses
• Advanced spectral correction for prism-to-single sensor adaptation
• Highly telecentric optical design for uniform illumination
• Bright and sharp image across the full frame
• Excellent color fidelity and contrast performance
• 2.6x magnification for proper image circle coverage
• Maximum input T-stop of T1.9
• Consistent performance across all aperture settings
• Flare-optimized coatings for improved image quality
• Universal Mount System for flexible camera compatibility
• Field-interchangeable mounts without re-shimming
• Compact and lightweight design for easy integration
• Precision engineered and handmade in Germany

Technical Specifications

• Optical design: 5 elements in 2 groups
• Magnification: 2.6x
• Maximum image diameter: 30.2 mm
• Recommended image diameter: 28.6 mm
• Maximum input T-stop: T1.9
• Light loss: approx. 2.5 stops
• Lens mount: B4 2/3”
• Camera mount: PL (UMS system)
• Compatible mounts: PL, EF, E, F, FZ, MFT
• Telecentric optical design
• Spectral correction for 3-chip prism systems
• Optimized for single-sensor digital cameras
• High contrast and color accuracy
• Flare reduction coatings applied
• Suitable for HD broadcast lenses
• Compatible with ARRI, RED, Sony, Canon, Panasonic systems
• Designed for professional cine and broadcast workflows

Dimensions and Weight

Length (B4 to PL): 61.6 mm
Diameter: 65.0 mm
Weight: 0.50 kg