The Leica R Lens to Blackmagic Cinema Camera Speed Booster from Metabones allows you to mount a Leica R lens on a Blackmagic Cinema Camera, while using custom optics to increase the angle of view and the maximum aperture of the lens.

The Speed Booster works by shrinking the image circle of your Leica R lens down to better fit the smaller sensor of the Blackmagic Cinema Camera. This has the effect of making the angle of view of the lens 0.64x wider or, in other terms, reducing the crop factor of the camera from 2.39x to 1.53x. This yields an angle of view similar to APS-C or Super 35 sized sensors.

When the Speed Booster concentrates the image circle from a lens, the brightness of the image is increased by 1 1/3 stops, with a maximum output aperture of f/0.9 when using a Leica R f/1.4 lens. In addition to lens speed and angle of view, the Speed Booster also increases the lens' MTF, or how faithfully the lens transfers detail from the object to the camera sensor. These increases in MTF are seen in the corners as well as the center of the images. For added lens support, a removable Arca-type tripod foot is included.

Fits Leica R Lens to BMCC MFT Mount    Reduces Crop Factor to 1.53x    Increases Maximum Aperture by 1 1/3 Stop    Removable Arca-Type Tripod Mount

Super telephotos such as the Telyt 560/5.6 may vignette at the corners.

The following lenses require modification in order to fit on the Speed Booster:

• Super-Elmar-R 15mm
• Elmarit R 28/2.8
• Elmarit R 35/2.8
• Summicron R 50/2

Related Questions and Answers

Q: 1. Has anyone tried this adapter with Sigma 85mm 1.4 ART? Because I've found some opinions that this set doesn't work.

A: We were unable to find negative reports on such a combination. Metabones does not exclude the Sigma 85mm 1.4 Art on its Metabones Nikon G Lens to Blackmagic Pocket Cinema Camera Speed Booster page. On the other hand, the Sigma 18-35mm f/1.8 DC HSM Art with this adapter has been a big success. We feel then you should not have issues using the 85mm and this adapter.

Q: 2. Is this the same Speed booster listed on the Metabones website that will connect BOTH Nikon G and F mount lenses to the BMPCC?

A: I'm pretty sure it is. I've owned this model for almost a year and use it with all my old manual Nikon AIS glass.

Q: 3. Would anyone happen to know if this would possibly work on the Blackmag Pocket Cinema Camera 4K that is coming out in September?

A: Metabones has not yet announced compatibility for their products and the new Pocket camera.

Q: 4. How do I measure light using this adaptor? As its manual aperture ring I would not be able to see lens f stop in camera. How to calculate maximum aperture for a lens? Do I have to multiply for 1 2/3? The results are not consistent. Please advice.

A: This device is meant to be used in conjunction with the camera's built-in light meter. The numerals of the lens are not stops of course, they are reference markings. As in the tradition of film cinematography, I recommend doing tests to determine what exposure you get at each of the reference markings.

Q: 5. Does this adapter support Nikon DX lenses as well as FX lenses?

A: Yes, this adapter will support both DX and FX lenses on a Pocket camera.

Q: 6. How do I know what my f-stop is?

A: You need to calculate depending of your lens.If you have a f2.0, the Speed Booster brings it to a f1.4 equivalent, which is your 0. Then from there you get f2.0 with F at 1 on the Speed Booster, then f2.8,4 etc...

Q: 7. will this work with the new blackmagic micro cinema camera?

A: Whilst the mount and the sensor size is the same on the two cameras, however this adapter was made specifically for the pocket camera with protruding lens at the back for the pocket camera with a much deeper collar than normal. So unless the micro camera also has such a deep collar, then the back of the adapter will touch and damage the sensor on the micro camera. Sorry I can't be much more help than that.

Q: 8. Will this mount to Digital Bolex MFT?

A: I am sorry but no. Please see this note from Metabones. Nikon-G/F to Micro-4/3 mount Speed BoosterTM adapters designed exclusively for the Blackmagic Pocket Cinema Camera (BMPCC). Note that this new 0.58x Speed Boosters will only attach to BMPCC equipped with a Micro-4/3 mount. They cannot be attached to standard Micro 4/3 cameras. Standard Micro 4/3 cameras would include the Digital Bolex. At this time, you would have to settle for this more conventional mount. Metabones Nikon F Lens to Micro Four Thirds Lens Mount Adapter (Black) B&H # MENFM43BM2

Q: 9. Since I have yashica ml lenses can I buy adapter CY to Nikon that will go in between speed booster and my lens and just use it

A: A Contax/Yashica lens to Nikon F-mount adapter in front of the Metabones Nikon G Lens to Blackmagic 2.5k Cinema Camera with Micro-4/3 Mount Speed Booster will allow for this adaptation to occur.

Q: 10. Will this product fit a Panasonic GH4 camera?

A: Yes, but you need to turn on the electronic shutters if not you will jam the shutter.