Metabones Contax Yashica CY to E-mount Speed Booster ULTRA 0.71x CINE

The Metabones Contax Yashica CY to E-mount Speed Booster ULTRA 0.71x CINE adapts vintage Contax Yashica CY lenses to Sony E-mount cameras, increasing lens speed by 1 stop, improving MTF, and making lenses 0.71x wider. Featuring a robust cine-style positive-lock mount, advanced 5-element/4-group optical design, and detachable tripod foot, this Speed Booster ULTRA delivers professional-grade optical performance for filmmakers and photographers.

Elevate your Contax Yashica CY lenses to modern mirrorless cameras with the Metabones Contax Yashica CY to E-mount Speed Booster ULTRA 0.71x CINE. Designed for Sony E-mount and DX-format mirrorless cameras, this Speed Booster ULTRA reduces the crop factor from 1.5x to 1.07x, making lenses appear wider while increasing maximum aperture by 1 stop. High-speed prime lenses, such as a 50mm f/1.2, are transformed into ultra-fast 35.5mm f/0.9 optics with remarkable edge-to-edge sharpness and minimal vignetting.

Its advanced 5-element/4-group optical design, crafted with ultra-high index tantalum-based glass by Caldwell Photographic in the USA, ensures sharper corners, lower distortion, and higher MTF performance. The cine-style positive-lock mount secures your vintage lenses with zero play, making it ideal for professional video production.

Built with precision-machined brass and plated with chromium, the adapter provides a durable, satin-finished surface and a precise fit with no wiggle or gap. The detachable Arca-type tripod foot allows stable mounting on popular ball heads. Smart Adapter™ technology supports electronic aperture control and EXIF data transmission, enabling seamless operation directly from the camera body in P, S, A, or M modes.

This Speed Booster ULTRA is fully optimized to maintain infinity focus while preserving the optical quality of lenses with floating elements or CRC designs, delivering unmatched versatility for filmmakers and photographers alike.

Key Features

• Reduces crop factor for DX-format cameras from 1.5x to 1.07x
• Increases maximum aperture by 1 stop
• Advanced 5-element/4-group optical design with ultra-high index tantalum-based glass
• Improves MTF, reduces distortion, and sharpens corners
• Cine-style positive-lock CY mount for zero play
• Makes lenses 0.71x wider
• Precision-machined brass with chromium plating and satin finish
• Detachable Arca-type tripod foot compatible with Arca Swiss, Markins, and Photo Clam ball heads
• True electronic aperture control (P, S, A, M modes)
• EXIF data transmission: lens identification, focal length, aperture