The Leica R Mount Lens to Sony E-Mount Camera Speed Booster ULTRA from Metabones improves upon the original Metabones Speed Booster with a 5 element/4 group optical design that incorporates ultra-high refractive index tantalum-based glass for improved sharpness and reduced distortion and vignetting. The Speed Booster ULTRA allows a full frame Leica R Mount lens to be mounted to an APS-C format E-Mount camera and in doing so, increases the angle of view and increases the maximum aperture by approximately one f/stop. 

When a lens intended for full frame sensors or 35mm film is mounted to a camera with an APS-C sized sensor, it transmits a larger area of light than the smaller sensor was built to accept and therefore the effective angle of view of the lens decreases. The Speed Booster condenses light from the lens and projects it onto the APS-C sensor allowing the sensor to utilize all of the lens' light and effectively reduces the crop factor of and APS-C E-Mount camera from 1.5x to 1.07x, producing a full-frame angle of view with an APS-C sensor. A corresponding increase in the maximum aperture of one f/stop makes the lens more effective in low-light situations and able to create a shallow depth of field. 

Metabones Speed Boosters are quality made using precision-machined brass with chromium plating on both the camera body and the lens side of the booster in order to ensure smooth mounting, quality aesthetic, and durability. This adapter has a detachable tripod foot that is compatible with Arca Swiss, Markins, and Photo Clam ball heads.

Although the lens will fit physically, automatic diaphragm (AE metering), or other auto functions are not retained using this speed booster.  These speed boosters are only fully compatible with mirrorless cameras housing APS-C or smaller image sensors. They will physically fit the Sony full frame mirrorless cameras, but the camera must be set in Crop Mode to fully support the speed booster's functions.

Leica R Mount Lens to Sony E-Mount Body    Ultra-High Index Tantalum-Based Glass    Increases Maximum Aperture by 1 f/Stop    Increases Angle of View by 0.71x    Infinity Focus Adjustment    Detachable Tripod Foot    Black Matte Interior; Black Exterior

Allows a full frame Leica R Mount lens to be mounted to an E-mount APS-C format camera and in doing so, increases the angle of view and increases the maximum aperture by one f/stop.

The Speed Booster ULTRA design incorporates ultra-high index tantalum-based optical glass for enhanced optical performance with improved corner sharpness and reduced distortion and vignetting. This glass technology and optical design perform extremely well with professional-grade f/2.8 zoom lenses and high-speed fixed focal length lenses such as a 50mm f/1.2 which will perform as a 35.5mm f/0.9 lens with high contrast and resolution from the center to the edges of the image.

Precise fit and solid connection - lens has no play, gap or wiggling when mounted on speed booster and no adjustments are required to fit your lens. Both the camera-side and the lens-side of the speed booster are made of brass which is precision-machined and chrome-plated.

The Speed Booster uses matte-black treatment to keep internal reflection to a minimum in order to maintain the maximum optical quality possible with the lens. The exterior features a black satin surface finish.

Designed to reach infinity focus while maintaining the correct registration distance required to maintain optical quality of CRC lenses or lenses with floating elements.

The speed booster features a detachable tripod foot which is compatible with Arca Swiss, Markins, Photo Clam ball heads.

Although the lens will fit physically, automatic diaphragm (AE metering), or other auto functions are not retained using this speed booster.

Related Questions and Answers

Q: 1. Please I need to know if this booster will permit me use my sigma lenses for Sony on a Nikon d850 camera?

A: This speed booster is intended to put Nikon lenses on a Sony body, not Sony lenses on a Nikon body.

Q: 2. Is this the Metabones adapter that would work w/ the Sony a7R II? I have older Nikon SF lenses. Thx!

A: No, that adapter is for Sony APS-C, E mount cameras. The Sony a7r II is full frame.And it is best that you come into chat or call us to discuss this further.

Q: 3. May I use this booster on A7 MarkII to mount Sony/Minolta Alpha lenses?

A: The Sony A7 II uses Sony E-Mount lenses. The Metabones Sony A-Mount Lens to Sony E-Mount Camera Speed Booster ULTRA (B&H # MESPAEBM2 MFR # MB_SPA-E-BM2) will allow you to use Sony A-Mount lenses with the E-Mount A7 II.

Q: 4. Can anyone confirm that this adapter works properly (and especially that it will allow me to obtain infinity focus on a Sony FS5) with zf.2 mount Zeiss Milvus 25, 35 f1.4, Milvus 50mm f2 Makroplanar and zf.2 (non-Milvus) 135 f2 APO? Thanks

A: While no one has reported using the outstanding Milvus line of lenses with this adapter and that camcorder, we see no reason it should not work as intended.

Q: 5. is it possible to use sigma 18-35 f1.8 sony lens to a7riii with this speed booster?

A: Yes, if you have an A mount lens, then it will work.

Q: 6. hey, i got the new sony FS5, and i got nikon F-mount/fx format lenses , dose any body know how this product works with the 2?

A: This adapter will allow you to use Nikon F mount lenses on a Sony FS5, yes.

Q: 7. Do this works in both cam 1, cam 2 and cam 3 lenses?

A: Yes, this adapter works with all Leica R lenses.

Q: 8. Does this adapter can be use on Sony a77 and Sony a99 ii for Sigma 800mm F-mount with AF? If not what adapter do you suggest to be able to use this camera with AF?

A: No, the Metabones Nikon F-Mount Lens to Sony E-Mount Camera Speed Booster ULTRA will not work with the Sony A99 or the A77: https://bhpho.to/2dRc0U1

Q: 9. My current camera is a Sony a7riii. I have a-mount glass 2.8 70-200 G & 85 1.4 zeiss... will this work seamlessly or do I have to completely switch to e-mount

A: Yes, you may use the Metabones Sony A-Mount Lens to Sony E-Mount Camera Speed Booster ULTRA with the Sony 70-200mm f/2.8 G SSM II Lens and the Sony Planar T* 85mm f/1.4 ZA Lens. Do note that this is a speed booster, with a 0.71x conversion and will make your lens one (1) f-stop brighter, so your 70-200mm f/2.8 lens will become the equivalent of a 49.7-142mm f/2 lens, and the 85mm f/1.4 will become the equivalent of a 60.4mm f/1 lens. When using a speedbooster on a full-frame camera such as the Sony Alpha a7R III Mirrorless Digital Camera, it is best to use the camera in APS-C crop mode as the speedbooster reduces the lens' imaging circle, so it will not cover the entire sensor.If you are looking for an adapter that will have no effect to the lens, allowing the lens to keep the same focal length and aperture (and imaging circle) for use of the full sensor, I would instead recommend the Sony A-Mount to E-Mount Lens Adapter (Black), B&H # SOLAEA3, for your usage needs. In either case, both adapters listed above allow you to use your Sony A-mount lenses on the Sony E-mount lens mount.

Q: 10. Does this adapter support autofocus on either SONY/Minolta's SSM af lenses or on the older SONY/Minolta screw drive af lenses?

A: Autofocus is not retained when using this adapter.