The Contax/Yashica CY Lens to L-Mount CINE Speed Booster ULTRA 0.71x from Metabones uses an advanced five-element in four-groups optical design, incorporating ultra-high index tantalum-based optical glass to achieve optical performance with improved corner sharpness, less distortion, and reduced vignetting. The Speed Booster ULTRA has a magnification of 0.71x and is well corrected for use with virtually all full-frame zoom and prime lenses regardless of exit pupil distance.

Contax/Yashica Lens to L-Mount Body    Supports In-Camera Aperture Control    0.71x Crop Factor Compensation    Aluminum Alloy and Brass Construction    1-Stop Increase in Lens Aperture    Positive-Lock L-Mount    5 Optical Elements in 4 Groups    Internal Flocking

Patented positive-lock L lens mount

The tripod foot is detachable and compatible with Arca-Swiss, Markins, and Photo Clam ball heads

Flocking to reduce internal reflection

Satin surface finish

Aluminum alloy and brass construction with chromium plating

Rubber gasket protects the mount connection from dust and moisture

Related Questions and Answers

Q: 1. Will this work with Cooke Minis?

A: It will not. Cooke Mini lenses cover a Super 35mm Sensor, this is a Speedbooster that requires lenses which cover a Full Frame Sensor. You would need to use the standard, none speedbooster adapter instead. https://bhpho.to/2CkcWYK

Q: 2. Does this adapter work on the Sony fx3?

A: The Metabones PL to Sony E-Mount T CINE Speed Booster ULTRA 0.71x is meant to be used with a camera with an APS-C sensor or with a full-frame camera in APS-C mode; this adapter would not work well with the FX3.

Q: 3. Can I use this with a Sony FS7 and a Fujinon XK20-120mm T3.5 Cabrio Premier Lens (PL Mount) ? Will there be cropping?

A: The Metabones PL to Sony E-Mount T CINE Speed Booster ULTRA 0.71x B&H # MEMBSPPLEBT1 requires that the lens be full frame. Unfortunately, the Fujinon XK20-120mm T3.5 Cabrio Premier Lens is not full frame. Therefore it is our opinion this combination will not be able to work. You can use this straight adapter to mount the lens to the FS7 and fully utilize the lens. Metabones MB_PL-E-BT1 PL to E-Mount Adapter with Internal Flocking B&H # MEMBPLEBT.

Q: 4. Can I use this with a Sony pxw Fx9 and a ziess cp. 3 Lens (PL Mount) ? Will there be cropping in FF 6K scan mode?

A: Yes, this may be used with the combination you described.

Q: 5. Can this be used with anamorphic lenses?

A: Yes, the Metabones PL to Sony E-Mount T CINE Speed Booster ULTRA 0.71x can be used with full frame anamorphic lenses that don't have rear lens protrusion more than 14.5mm where it can hit the optical element in the adapter.

Q: 6. Can I use effectively with FX6 and Fujinon Cabrio PL lenses?

A: No you can NOT

Q: 7. I have a Sony FS7 & FX9. I have a Fujinon 20-120, and Cooke Mini S4s. I understand there might be some vignetting which is fine. I wanted to know if you still get the speed boost stop with any PL lens. I don't understand how it could only open up full frame lenses? Thanks.

A: This will only work with Full-Frame PL Lens. In theory it should allow in more light on any lens, but it is not designed to work with lenses that do not cover a full frame sensor and we do not recommend it.

Q: 8. is this compatible with a Sony fs700rh so I can use any prime lens?

A: This adapter allows you to use Full Frame PL Mount Lenses on Sony E-Mount Cameras that have a Super 35mm or APS-C Sized Sensor. The FS700 has a Super 35mm Sensor. If you have Full Frame PL Mount lenses, you will be able to use this adapter and mount them on to your FS700.

Q: 9. Hi. Would you be able to provide the measurements of the speedbooster without the tripod foot attached? I'm not sure if this will fit with my camera cage attached. Those knobs may interfere. Thank you.

A: The dimensions of the Metabones Speedbooster Ultra 0.71x Cine Adapter 0.71x Cine Adapter is 75.99 millimeters, see picture below.

Q: 10. Would this work with older black magic cinema camera 2.5 k and full frame yashica ml lenses

A: The Metabones Speed Booster Ultra 0.71x Cine Adapter for Contax/Yashica-Mount Lens to Micro Four Thirds-Mount Camera is compatible with the Blackmagic Design Cinema Camera (MFT Mount) and Yashica ML Lenses.