The ALPA Lens to FUJIFILM X-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 ALPA lens to be mounted to an APS-C format X-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 increases. 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. 

Although the lens will fit physically, automatic diaphragm (AE metering), or other auto functions are not retained using this speed booster.  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. A matte black interior reduces internal reflections and a black satin finish external surface matches with most camera bodies and lenses. This adapter has a tripod foot that is compatible with Arca Swiss, Markins, and Photo Clam ball heads, and can be removed if needed with an included hex key.

ALPA Lens to FUJIFILM X-Mount    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 ALPA lens to be mounted to an FUJIFILM X-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. The booster may attach to a quick release plate or tripod using a 1/4"-20 screw.

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

Two hex keys included with the product, one to detach the tripod foot and another to tighten a mounting screw

Related Questions and Answers

Q: 1. does this converter work with zoom lenses (i.e. nikon VRII 70-200 f2.8) or only prime lenses?

A: It works fine with zooms as well as primes. There are a couple of lenses that physically do not fit, but the 70-200 should be fine (and making it effectively an f2 lens). Be aware though that it will be a manual focus lens at that point. No AF.

Q: 2. Given that the lens will be completely manual once I have set the aperture how do I know which shutter speed to set?

A: With the Metabones Nikon F-Mount G Lens to FUJIFILM X-Mount Camera Speed Booster ULTRA, for photos you determine the shutter speed based on the available light, focal length, ISO, and aperture.

Q: 3. "Although the lens will fit physically, automatic diaphragm (AE metering), or other auto functions will not be retained using this speed booster." Does that mean Aperture priority , Shutter priority, and Auto exposure are not supported ? Only full Manual exposure is available ?

A: You will have full auto focus, and auto metering.

Q: 4. Hi, does this speedboster allow IBIS to work with mechanical lenses? I use old vintage lenses adapted to EF. Also, does the Autofocus work with Canon and Sigma EF lenses?

A: If using this adapter with a Fuji X body like the X-T4, which has built in stabilization, you can still utilize that feature with adapted EF lenses.

Q: 5. How fast is it compare to fringer?

A: The Fringer does not increase speed

Q: 6. Does it work with the teleconverter Nikon TC-20F?

A: No, the Metabones Nikon F-Mount G Lens to FUJIFILM X-Mount Camera Speed Booster does not work with the Nikon TC-20F. The Nikon TC-20F works only with the following lens Nikon 70-200mm f/2.8 Nikon AF-S NIKKOR 200mm f/2G ED VR II Nikon AF-S NIKKOR 300mm f/2.8G ED VR II Nikon AF-S NIKKOR 300mm f/4E PF ED VR Nikon AF-S NIKKOR 400mm f/2.8D ED-IF II Nikon AF-S NIKKOR 400mm f/2.8E FL ED VR Nikon AF-S NIKKOR 500mm f/5.6E PF ED VR Nikon AF-S NIKKOR 70-200mm f/2.8E FL ED VR Nikon AF-S NIKKOR 70-200mm f/2.8E FL ED VR 100th Anniversary Edition

Q: 7. I cant find a dedicated Speed Booster for Nikon F mount to Fuji X. I need to be able to connect a Samyang 24mm (Nikon F mount) to the Metabones Speed Booster, however I'm worried that because the Speed Booster is for an 'F mount G lens' that the F mount (non-G) lens wont work, or be able to change focus or aperture. Any experience with this? Thanks,

A: The metabones will work perfectly. You don't need to have G lenses for the adapter to work 100%.

Q: 8. Will the speed booster support Tamron F mount lenses such as the Tamron SP 85mm f/1.8 Di VC USD Lens and would it loose its VC or any other side effects apart from AF and AE? Would the focal length or minimum focus distance change?

A: VC will be disabled as the adapter has no electronic contacts. Apart from that, the lens' focal length will change due to crop factor and the speedbooster's optical element (85mm x 1.5 crop factor x 0.71 optical element) and its maximum aperture will increase by a stop (as far as light collection is concerned).

Q: 9. 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: 10. The description doesn't mention autofocus -- just to confirm, this is the newest version that allows PDAF autofocus on Fuji cameras?

A: This is the newest version that allows PDAF on Fuji cameras. The model number for is the X-BT1.