Metabones T Speed Booster Ultra 0.71x Adapter for Canon Full-Frame EF-Mount Lens to Micro Four Thirds-Mount Camera

Metabones T Speed Booster Ultra 0.71x Adapter for Canon Full-Frame EF-Mount Lens to Micro Four Thirds-Mount Camera

Metabones T Speed Booster Ultra 0.71x Adapter for Canon Full-Frame EF-Mount Lens to Micro Four Thirds-Mount Camera

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Product Highlights

  • Canon EF Lens to Micro 4/3 Body
  • Full-Frame Lens to Micro 4/3 Camera Body
  • Supports In-Camera Aperture Control
  • 0.71x Micro 4/3 Crop Factor Compensation
  • 1-Stop Increase in Lens Apertures
  • 5 Optical Elements in 4 Groups
  • Locking Mechanism to Secure Lens
  • Push-Button Lens Release
  • Brass Mounting Rings
  • Detachable Tripod Foot
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Metabones MB_SPEF-M43-BT4 overview

  • 1Description

The T Speed Booster Ultra 0.71x Adapter for Canon Full-Frame EF-Mount Lens to Micro Four Thirds-Mount Camera from Metabones allows a full-frame Canon EF-mount lens to be mounted onto a Micro Four Thirds-mount camera. While doing so, the adapter's optics help to maximize the connected lens's apparent angle of view while providing a 1-stop increase for the camera over the lens's aperture range.

If a lens intended for 35mm film or similarly-sized full-frame camera sensors is connected to a camera with a Micro Four Thirds-sized sensor, it would project an image larger than the Micro Four Thirds sensor was built to accept. Able to capture only the center portion of the projected image, the effective angle of view of the lens would be narrowed, creating an in-camera "crop factor." The T Speed Booster Ultra 0.71x Adapter for Canon Full-Frame EF-Mount Lens to Micro Four Thirds-Mount Camera condenses the light from a lens designed for 35mm film or "full frame" camera sensors and projects it onto a Micro Four Thirds sensor. This allows a Micro Four Thirds sensor to utilize more of the light gathered by a connected lens, which effectively reduces the crop factor while making available to the sensor an additional 1 stop of light for each of the lens's f/stop settings.

This adapter is constructed from aluminum alloy for durability while minimizing weight and its mounting rings are made with brass to further prevent wear-and-tear. Inside are five lens elements in four groups that are designed to provide optical clarity as well as color fidelity, and a detachable tripod foot is included that features 1/4"-20 threads as well as compatibility with Arca-Swiss tripod heads.

The T Speed Booster Ultra 0.71x Adapter for Canon Full-Frame EF-Mount Lens to Micro Four Thirds-Mount Camera supports electronic communication between an attached camera and lens. If the lens includes autofocus, image stabilization, as well as camera-controlled aperture functions, this adapter is intended to allow those features to be used. Also, if an attached lens is capable of generating EXIF metadata when used with a directly compatible camera, the T Speed Booster Ultra 0.71x Adapter for Canon Full-Frame EF-Mount Lens to Micro Four Thirds-Mount Camera is designed to allow that information to be saved along with image files generated with a combination of the lens, a compatible Micro Four Thirds-mount camera, and the adapter.

  • Allows a full-frame Canon EF-mount lens to be used with a Micro Four Thirds-mount camera
  • Maximizes apparent angle of view of combined camera and lens
  • Provides a 1-stop increase for the camera over the lens's aperture range
  • Integrated jog dial for incremental aperture adjustment and push-button access to lens's widest aperture setting when used with a compatible Panasonic camera
  • Five lens elements in four groups for optical clarity as well as color fidelity
  • Supports electronic communication between camera and lens to enable autofocus, image stabilization, on-camera aperture control, and EXIF metadata generation when possible
  • Internal coating minimizes reflections within the adapter barrel
  • Detachable, Arca-Swiss compatible tripod foot with 3/8" threads
  • Aluminum alloy components for weight reduction
  • Brass mounting rings prevent wear-and-tear
  • Locking mechanism for secure attachment of lens with push-button release
In the Box
Metabones T Speed Booster Ultra 0.71x Adapter for Canon Full-Frame EF-Mount Lens to Micro Four Thirds-Mount Camera
  • Front Cap
  • Rear Cap
  • Tripod Foot Key
  • Limited 1-Year Warranty
  • Table of Contents
    • 1Description

    Metabones MB_SPEF-M43-BT4 specs

    Camera Mount Micro Four Thirds
    Lens Mount Canon EF
    Magnification 0.71x
    Optical Design 5 Elements in 4 Groups
    Dimensions : 2.6 x D: 0.9" / : 6.5 x D: 2.4 cm
    Weight 6.1 oz / 172.0 g
    Packaging Info
    Package Weight 0.75 lb
    Box Dimensions (LxWxH) 4.331 x 4.173 x 2.362"

    Metabones MB_SPEF-M43-BT4 reviews

    T Speed Booster Ultra 0.71x Adapter for Canon Full-Frame EF-Mount Lens to Micro Four Thirds-Mount Camera is rated 4.5 out of 5 by 66.
    Rated 1 out of 5 by from Contacts too tight I bought this hearing only good things about Metabones. The optics worked as far as I could tell, but the contacts were too tight/large, and the moment I tried putting it onto my AF100, one of the contacts broke off. The other contacts pressed too tightly against some of my other EF lenses, causing small divots in their flat contacts. Then the Metabones felt fabric on the inside of the adaptor started rubbing off because everything was just too tight. I didn't even have an opportunity to test the aperture ability.So basically, it damaged (not fatally) my gear, and didn't work as advertised. I really hope I got a lemon.
    Date published: 2015-09-08
    Rated 5 out of 5 by from Works Perfect with the GH4 !! After about 2 weeks with this product I can honestly say I do not regret the price tag on this adapter. Every bit of this product is well made, and the firmware update was a 2 minute process. I switched to the ULTRA after buying the XL and I am so happy I switched. The Metabones website claims the XL is intended for the GH4, but I noticed an annoying vignetting. With the ULTRA the vignetting has disappeared with my Sigma 18-35mm lens. On the side of the adapter is a manual F-stop focus adjustment which I never use. All-in-all I'm happy with the ULTRA Metabones Adapter, and have noticed no lack of clarity in my photos / 4k video. GO BUY IT!
    Date published: 2016-10-05
    Rated 5 out of 5 by from Metabones adapter for both EF-S and Full Frame lenses The Metabones adapter adds roughly a stop of light and widens your field of view on a given lens. The optics are great. If you are going to use any EF-S lenses on Micro 4/3rd cameras, this is the adapter to get. If you're only going to use full frame lenses, the XL .64x adapter will give you slightly more light and wider view. The only thing that I wish this did that it does not is allow aperture control from my GH5. Always a chance that it will be added via firmware, but no guarantees. There is an aperture control rocker on the adapter, so you can still change it, but it's not as intuitive to grab as the camera controls.
    Date published: 2017-09-18
    Rated 5 out of 5 by from - 4K FULL FRAME AT A FRACTION OF THE COST - AMAZING COMBO I have been looking into the camera market for some time now and have done countless hours of research. It honestly comes down to what your needs our rather than strictly the best camera. For the price range of around $1000, there are several top contenders. I bought the GH4 for it's 4k ability while remaining an affordable product. If you are going to save money with the 4/3 sensor, than this product, the metabones speed booster is a must. It's the closest way you can imitate full frame 4k at a fraction of the cost. There are two different speed boosters however, the ultra and the XL. While the XL will give you a wider FOV (field of view) it really was only designed for 4k video and the extra crop, 2.3x, that comes with the GH4. The GH4 has so many more functions than just its affordable 4k that buying the XL only inhibits it. The 96fps is a great feature. Using the XL vignettes the lens, and that's something you never want. Especially because there's a lot of nice glass that uses an APS-C mount not a full frame. A great example is the Sigma Art 18-35. This is one of the best lens's that the GH4-Ultra Metabones can have. So, if you want to use the 4K, 96fps, 1080 60fps at 200mbs, and take photos, the 16mp camera can still take some stunning shots, buy the .71x Ultra adapter. It's the best third party camera mod you can do to create a cheaper micro 4/3 sensor a full frame 4K beast for a fraction of the cost. I did it and it worked amazing for me. And let's be honest, B and H is the top market vendor to buy from. They are going to hook you up with great customer service, fast shipping, and a clean, ready to go, product. Check out my youtube channel to see what the Gh4 and Metabones can do for you.
    Date published: 2017-01-31
    Rated 4 out of 5 by from No more using the T3i to change my Sigma 18-35mm F-Stop. I bought the T Speed Booster Ultra to adapt my Sigma 18-35mm lens to my GH5 that I use primarily for video. After watching reviews on youtube I was convinced that this is what I needed to make my end product standards on par with what I was seeing out there. I am not disappointed at all. I can now shoot at f1.2 which is great in low light conditions. I don't have to walk around with my T3i to change the change the F-Stop on my lens. I can do it on camera now,
    Date published: 2017-10-03
    Rated 2 out of 5 by from Faulty product, poor customer service I purchased the Metabones Speed Booster to pair the JVC LS300 with my canon EF lenses. Starting with the good things: the .71x magnification is GREAT for keeping my wide lenses wide enough, and the extra stop of light seems almost magical. Considering the LS300 does have noise issues above 1600 ISO, being able to stop down my 2.8 lenses to 2.0 has allowed for some great low light shooting. The build quality feels great, and I am able to put some seriously heavy glass on the front of a fairly lightweight camera, and the connection feels rock solid. HOWEVER, my favorite lens, my Canon 85mm 1.2L II, doesn't work with this camera/adapter combo. It pairs with my Micro Four Thirds still camera, but not with the JVC. Of note: both the LS300 & 85mm 1.2L II are listed as compatible on the Metabones website. When I contacted customer service, they first asked me to ship the unit to them for testing and repair, on my dime. I have been using the LS300 for gigs every week since I bought it, so that was not gonna work. They then asked me to send them a video of the problem, so I did (basically, I showed them that as soon as the lens clicks into place, the LCD screen goes to black). Then they sent me replacement front and rear mounting plates to test out, but it did not solve the problem. Since then, their customer service has become non-existent. The last e-mail they sent me was two weeks ago, and all it asked was if there was any visible damage to the unit. I responded that no, there wasn't, and haven't heard from them since, despite several follow up e-mails. I feel like I've been ghosted. Nothing else does what the Speed Booster can do, and it is essential to my filmmaking kit, so I'm left without a lot of options. I will just say this is a very expensive product that may not work as claimed on both this site and the Metabones website. And in the event it doesn't work, the customer service at Metabones is spotty at best. Apparently, we buy at our own risk.
    Date published: 2016-08-07
    Rated 5 out of 5 by from Combine with Sigma 18-35mm, so amazing!!!! I use this adapter on Panasonic G85 with Sigma 18-35mm F1.8, so amazing, auto focus is fast enough for me. I love this product.
    Date published: 2017-03-02
    Rated 5 out of 5 by from Works great! Lets me use all my Canon L-lenses. This is a great little device - not only does it let me use my Canon glass on my Olympus OM-D E-M5 Mark II but it reduces the crop factor, while giving me one more stop of light. Initially the autofocus did not work, but after a quick software update it works perfectly. I was amazed that auto focus works on my EF 400mm f5.6/USM lens with the 2.0 teleconverter attached - pretty impressive.
    Date published: 2016-02-28
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