Metabones Contax Yashica CY Lens to Canon RF Mount CINE Speed Booster Ultra 0.71x Adapter, Black

SKU: MBSPCYEFRBM1 MFR: MB_SPCY-EFR-BM1
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Key Features

  • Boost your Canon RF with this Metabones adapter for Contax/Yashica CY lenses.
  • Get a wider field of view with the 0.71x Speed Booster Ultra lens adapter.
  • Maximize aperture; reach f/0.90 with a f/1.2 lens using this lens adapter.
  • Maintain image quality; enjoy <1% rectilinear distortion with this adapter.
  • Achieve a 1.07x crop factor on DX cameras using this lens mount adapter.
  • Arca Swiss compatible tripod mount offers stable support with this adapter.
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Special Order?Estimated to Ship: 08/11/2025
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Metabones Contax Yashica CY Lens to Canon RF Mount CINE Ultra 0.71x Adapter Specifications

  • Color

    Black Satin Exterior
    Black Matte Interior

  • Magnification

    0.71x

  • Crop Factor with DX format Camera

    1.07x

  • Maximum Output Aperture

    f/0.90 (with f/1.2 Lens Attached)

  • Rectilinear Distortion

    < 1%

  • Lens Elements/Groups

    5/4

  • Length Reduction

    4.2 mm

  • Camera Mount

    Canon RF

  • Image Format

    DX, APS-C

  • Lens Mounts

    Contax Yashica

  • Lens Compatibility

    Any full-frame lens with the appropriate mount can be used. DX lenses can be mounted but will result in severe vignetting in most cases. Canon EF-S Z lenses are not supported.

  • Special Features

    Long-throw clickless aperture ring on Nikon F/G version; AF/IS support and in-camera aperture selection with Canon EF to Sony E version.

  • Tripod Mount

    Robust Removable Type with Arca Swiss Compatibility

  • Dimensions

    1.06 x 2.99 x 2.83" (27 x 76 x 72mm) for Canon EF version

  • Weight

    6.80 oz (193g)

  • UPC Code

    4897050182963

Models
Metabones Contax Yashica CY Lens to Canon RF Mount CINE Ultra 0.71x Adapter
$489.00

Special Order

Generally ships in 7-14 days, subject to availability

Metabones PL Mount Lens to Canon RF T CINE Speed Booster ULTRA 0.71x II Adapter
$719.00

On Backorder

Order now, your card will not be charged until it is ready to ship.

FeaturesSpeedBooster / BaveyesSpeedBooster / BaveyesFull AF Adapter
Style-StandardWith ND Filter
Camera Fitting (Male)Canon RFCanon RFCanon RF
Lens Fitting (Female)Contax/YashicaPL MountCanon EOS

About Metabones Contax Yashica CY Lens to Canon RF Mount CINE Ultra 0.71x Adapter

With the high-quality Contax Yashica CY Lens to Canon RF Mount CINE Speed Booster Ultra 0.71x Adapter, you can unlock the full potential of your camera. This innovative adapter is designed to be compatible with both Contax/Yashica lenses and Canon RF mount cameras, making it a versatile addition to your photography equipment.

The adapter boasts a compact design, featuring an advanced 5-element/4-group optical design that incorporates ultra-high index tanatalum-based optical glass. This ensures extraordinary optical performance, with improved corner sharpness, less distortion, and reduced vignetting.

The Speed Booster Ultra has a magnification of 0.71x, effectively reducing the crop factor of mirrorless cameras with DX-sized sensors. This makes it ideal for use with professional-grade f/2.8 zoom lenses such as the 24-70mm f/2.8 and 70-200mm f/2.8 zooms by Canon and Nikon.

The adapter is well corrected for use with virtually all full-frame SLR lenses, regardless of exit pupil distance. This means it performs exceptionally well with high-speed fixed focal length lenses, transforming a 50mm f/1.2 into a 35.5mm f/0.9 lens with excellent contrast and resolution from the center to the edges of the image.

The Contax Yashica CY Lens to Canon RF Mount CINE Speed Booster Ultra 0.71x Adapter is made of durable, precision-machined brass with chromium plating on both the camera-body and the lens sides. This ensures smooth mounting, a great appearance, and long-lasting durability. The lens side of the adapter features a strong leaf-spring structure, strengthening the adapter-lens connection and ensuring tightness of the lens to reduce wear and prevent focus errors and optical alignment issues.

The adapter also features true electronic integration of the aperture diaphragm, allowing the camera to automatically choose the aperture in P or S exposure modes, or for you to dial in yourself on the camera body in A or M modes.

Experience the difference with the Contax Yashica CY Lens to Canon RF Mount CINE Speed Booster Ultra 0.71x Adapter, a product that combines design, workmanship, and technology to deliver the best possible optical quality.

Metabones Contax Yashica CY Lens to Canon RF Mount CINE Ultra 0.71x Adapter Features

  • Contax Yashica CY mount lens to Canon RF-mount cameras
  • Increase maximum aperture by 1 stop
  • Increase MTF
  • Makes lens 0.71x wider
  • Advanced 5-element/4-group optical design incorporating ultra-high index tantalum-based optical glass by Caldwell Photographic in the USA (patent granted)
  • Positive-lock CY lens mount, the robust cine-style positive locking mechanism to ensure that no play when attaching the vintage lenses
  • Satin Surface Finish
  • Aluminum Alloy and Brass Construction with Chromium Plating
  • Rubber gasket protects the RF-mount connection from dust and moisture
  • Detachable Arca-Type tripod foot compatible with Arca Swiss, Markins, and Photo Clam ball heads(clamp directly or attach to quick release plate by a 1/4"-20 screw)
  • The product is designed for the APS-C format camera (eg. Canon C70 and RED Komodo, etc.) or using with the APS-Crop mode of EOS R3, R5, R6, EOS R and EOS RP

Warranty Information

This product has a limited warranty of 12 months.

Key Features

  • Boost your Canon RF with this Metabones adapter for Contax/Yashica CY lenses.
  • Get a wider field of view with the 0.71x Speed Booster Ultra lens adapter.
  • Maximize aperture; reach f/0.90 with a f/1.2 lens using this lens adapter.
  • Maintain image quality; enjoy <1% rectilinear distortion with this adapter.
  • Achieve a 1.07x crop factor on DX cameras using this lens mount adapter.
  • Arca Swiss compatible tripod mount offers stable support with this adapter.

What's in the box:

  • Metabones Contax Yashica CY Lens to Canon RF Mount CINE Speed Booster Ultra 0.71x Adapter (Black)
  • Metabones 1 Year Limited Warranty