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. 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: 2. 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.

Q: 3. 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: 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. 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: 6. 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: 7. 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: 8. Does this item work well with PXW-FS7 and Nikon F and G lenses?

A: I bought it to use on a Sony FS100 with my Nikon lenses. I've not put it through a great workout yet but I have used it several times with no problems. It's very well built, it feels very snug and secure even with heavier lenses, though it still attaches (or removes) to the camera and lenses smoothly. As for F&G lenses, I've only used it with the F mounts, but I just stuck a G on there and looked, it operates the aperture on it as well. The aperture ring on the Metabones has no click stops, so it rolls smoothly with just a tiny bit of resistance (good). I've also bought one for using on a GH-4 which is a micro 4/3 mount. I'd recommend them.

Q: 9. Will IBIS (in body image stabilization) work with this adapter?

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

Q: 10. Will this work on the Sony fx9 full frame without vignetting?

A: The adapter is designed to take full frame down to APS-C size, so you will have vignetting.