The ALPA 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 ALPA 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.

ALPA 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 ALPA 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. I have nikon FX lense, Is this adapter work on my new A6300 ? and does it auto focus on A6300?

A: I bought it to use on my Sony A7. Unfortunately it did not work and I had to return the product. This was a number of years ago though so things may be different now. The good news was I had the option to try it and they return it when it didn't work.

Q: 2. So I understand this will not work well with Nikon fx lenses on a Sony a7sii because of its full fram sensor, however does anybody know of any other adapters that would make it possible to use Nikon FX lenses with the Sony a7sii ? Please help!

A: You could use an adapter such as that made by Novoflex, B&H # NOANSNEX.

Q: 3. Will IBIS (in body image stabilization) work with this adapter?

A: Yes you can use the in body stabilizer with this adapter.

Q: 4. Okay, I'm not sure if this question was answered, but will this speed booster make my shot Full Frame? I'm using a Sony a7s, with Nikon AIS glass.

A: Sorry, I using tris adapter nikkor Lens to Hasselblad Lunar The type sensor is APS. Is like de Sony Next 7 E mount. But nikkor len ASi works very well .

Q: 5. I have some late 80's early 90's Minolta AF A-mount lenses , like the 100mm 2.8 / 50mm 1.4 / and 500mm 8. Would these autofocus on the sony 7rii in Video Mode? Thanks

A: A to E Mount adapters can give you autofocus. https://bhpho.to/2qaXWtu

Q: 6. 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: 7. Will this booster work with Sony Nex 5T?

A: Yes, this adapter is compatible with the Sony NEX-5T.

Q: 8. Would the concentrated image from a tilt-shift lens cover the area of a full frame sensor, or was this made to only cover apsc?

A: The Metabones Nikon F-Mount Lens to Sony E-Mount Camera Speed Booster ULTRA is only made for an APS-C format E-Mount camera so it will not cover the the area of a full frame sensor with the concentrated image from a tilt-shift lens.

Q: 9. In reference to my question about this adapter I made an error instead of Sony A77 and A99 ii. Suppose to be Sony a6000, Sony a6500 and Sony a7R ii. for Sigma 800mm F-mount with AF? If not what adapter do you suggest for this cameras with an AF? Thanks.

A: It is important to understand that one would use the Metabones Nikon F-Mount Lens to Sony E-Mount Camera Speed Booster ULTRA when using the Nikon F mount lens on an ASPS-C size sensor found on the A6000, A6300, A6400, A6500, but not on a Full Frame camera like Sony A7RII. For full frame one would use a different adapter: https://bhpho.to/2Swmn0U

Q: 10. Will this adapter work with the auto focus function on my Nikon f mount 14-24mm to my Sony a7r full frame camera?

A: Sorry, no. This adapter has no electronic connection between the lens and the camera therefore no auto focus or auto exposure is possible.