This Speed Booster Ultra 0.71x Adapter from Metabones allows a Nikon F-mount lens to be mounted onto a Nikon Z-mount camera. The adapter helps maximize the apparent angle of view of the lens while providing a 1-stop increase for the camera over the lens's aperture range.

The adapter is constructed from aluminum alloy for durability while minimizing weight. The mounting rings are made with brass to further prevent wear and tear. Inside the adapter are five lens elements in four groups. For improved prevention of internal ghosting and reflections, the lens elements are constructed from high-index tantalum-based glass. A detachable tripod foot offers 1/4"-20 threads and an Arca-type dovetail.

The adapter does not support electronic communication between a lens and camera. An aperture dial is built in for aperture control of Nikon G-type lenses, which do not have an aperture ring. Nikon AI or many post-Nikon AI lenses can have their aperture settings widened or narrowed using their built-in aperture control rings if preferred.

Nikon F Lens to Nikon Z Body    0.71x Magnification    1-Stop Increase in Lens Apertures    5 Optical Elements in 4 Groups    Brass Mounting Rings    Weather-Sealed Adapter-to-Camera Mount    Arca-Type Tripod Foot with 1/4"-20

• Attach Nikon F-mount lenses to Nikon Z-mount cameras, such as the Nikon Z50

• Compatible with NIKKOR G and F lenses (including non-AI and AI lens mounts)

• Clickless aperture ring covers an 8-stop range marking, clearly indicating the actual number of stops

• 5-element/4-group optical design incorporating ultra-high index tantalum-based optical glass

• Increases maximum aperture by 1 stop

• Increases MTF

• Makes lens 0.71x wider

• Aluminum alloy and brass construction with chromium plating

• Rubber gasket protects the Z-mount connection from dust and moisture

• Satin surface finish

• Detachable Arca-type tripod foot with a 1/4"-20 thread

• NIKKOR F-mount (including NIKKOR G series, AF-D, AI-P, AIS, AI, and non-AI lenses)

• NIKKOR DX lenses and third-party lenses designed for the APS-C format (due to the limitation of image coverage)

• NIKKOR 2.1cm f/4

• NIKKOR AI-S 20mm f/2.8

• NIKKOR E series

Related Questions and Answers

Q: 1. Investigating whether this would work with Sony FS5 II and Nikon 500mm f/4 lens or perhaps Nikon 200-400mm f/4. Would I be able to control aperture? Not worried about AF.

A: The Metabones Nikon F-Mount Lens to Sony E-Mount Camera Speed Booster ULTRA will mount onto the Nikon 500mm f/4, or the 200-400mm f/4, but one would not be able to receive electronic control of the lens aperture or auto focus when one is connected to the Sony FS5 II.

Q: 2. Is this adapter compatible with the ZEISS Milvus 50mm f/1.4 ZF.2 lens?

A: Yes, the ZEISS Milvus 50mm f/1.4 ZF.2 Lens for Nikon F would be compatible for use with the Metabones Speed Booster Ultra 0.71x Adapter for Nikon G Lens to Nikon Z-Mount Camera to connect the lens to a Nikon Mirrorless Camera that uses the Nikon Z-mount lens mount. Do note that this lens adapter does not support electronic communication between an attached camera and lens. As such, you will have to focus the lens manually and set your exposure manually. You may either use the aperture ring built onto the lens or built onto the lens mount adapter to control the amount of light entering the camera.

Q: 3. Will the speed booster metabones adapter turn on the aps-c mode on my sony a7s ii if i got to use it with the canon full frame lens? Or it will never get the aps-c mode activated on the sony a7s ii?

A: This was mostly answered above. The Speedbooster is designed for using fullframe lenses on APS-C or S35 cameras. It should work with the A7SII with the camera set in APS-C mode. It will not activate the APS-C mode as that has to be done manually.

Q: 4. what are the numbers on the ring?

A: I believe you are referring to the aperture ring. A built-in clickless aperture control ring enables manual control of aperture from the speed booster. This 8-stop ring with clearly marked 1/2-stop markings is shipped as clickless.

Q: 5. Will this work with the 14-24 f2.8 WA zoom? Answers to this question seem to have some questions as to whether they are accurate.Thanks

A: It will work and you will keep the same focal length contrary to the inaccurate information that's on the web saying that it reduces your 14-24 to 10-17. Also you will be stuck at shooting f2.8 since it does not have an aperture ring. Finally, depth of field remains the same. F2.8 will still be f2.8 but you will get a stop of extra light. This speedbooster works best with lenses that have an aperture ring. The more you know.

Q: 6. How well does the camera's autofocus system work with a Nikon F-mount lens using this adapter?

A: There is no AF function with this adapter.

Q: 7. Will this adapter communicate iris information to the camera? Specifically zeiss planar zf lenses and sony fs5 camera.

A: No auto functions are not retained using this speed booster.

Q: 8. Will using this on an FS7 with full frame lenses negate the crop factor?

A: The Metabones Nikon F-Mount Lens to Sony E-Mount Camera Speed Booster ULTRA, B&H # MESPNFGEBM2, has no effect to crop factor. The Sony PXW-FS7 XDCAM Super 35 Camera System uses a Super 35 CMOS sensor. When comparing the angle of view of a lens used on the Sony PXW-FS7 XDCAM compared to a camera with a full-frame sensor, there is a 1.4x crop factor (technically, 1.392x). As an example, the Nikon AF-S NIKKOR 50mm f/1.4G Lens used on a camera with a Super 35 sensor will have the equivalent angle of view of a 70mm lens used on a full-frame camera.

Q: 9. Apologies, I meant Nikon AF lenses. - Mark ? in Canada

A: I see the correction you made but that still is not the correct adapter.This will work on your camera with the Nikon AF lenses, Metabones Nikon G Lens to Sony NEX Camera Lens Mount Adapter (Matte Black) B&H # MENFGEBM1 MFR # MB_NFG-E-BM1.

Q: 10. Does autofocus work on this speed booster?

A: No, it would not. We have no lens adapters, neither standard or Speed Booster design, that are designed to retain autofocus communication between Nikon F-mount lenses and the Fujifilm X-mount. There are no electronic contacts on the Metabones lens adapter for electronic communication between the camera and the lens. Although the lens will fit physically, automatic diaphragm (AE metering), or other auto functions are not retained using this speed booster.