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Metabones lens speed booster adapter, focal reducer
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  • Firmware update

    Vancouver, Canada, June 23, 2016: Metabones® releases Metabones App 2.3, a major firmware update with the following additional features.

    • Eye-AF (A6300/A7series).
    • Fast contrast detect AF for all E-Mount cameras.
    • DMF (direct manual focus) for E-Mount cameras, where the camera switches to MF as soon as AF completes. This is useful for checking AF accuracy when used with focus peaking.
    • Smooth iris for Sony E-Mount and FZ-Mount cameras and Blackmagic, JVC and Panasonic Micro Four Thirds Mount cameras.

    Metabones® has already added fast EF lens autofocus to its Micro Four Thirds Mount Speed Boosters® and Smart Adapters™ last year. With this speedy advantage now extended to E-Mount, EF-Mount lenses are now capable of focusing quickly across the widest variety of mirrorless cameras with trusted Metabones precision and reliability.

    The smooth iris feature slows down the movement of the electromagnetic aperture diaphragm so that video footage transitions smoothly when the aperture changes, with reduced tick noise from the lens. The latest Canon and Tamron SP lenses have special support for this feature and Metabones® makes use of it if the lens supports it.

    Limitations:

    • E-Mount "native" autofocus features may not work with all lenses.
    • "Native" autofocus may be lesser in performance and/or accuracy compared to the original "Green" mode phase-detect autofocus for A6300, A7 Mark II and A7R Mark II.
    • AF-C and video autofocus may have unsatisfactory AF performance and/or accuracy. This is a limitation inherent in DSLR lenses, which lack the low latency required for making many fine movements in rapid succession during AF-C and video focusing.
    • Excessive hunting may occur if a small aperture is used with AF-C, video or "Liveview Display Setting Effect" turned on.
    • The first few autofocus attempts may result in false positives where the camera gives focus confirmation but the subject is not in focus. This issue goes away on its own after a few trials with most lenses.
    • No support for in-camera correction such as peripheral shading, CA and distortion.
    • Power consumption may increase compared to the original "Green" mode autofocus. We recommend turning off the "Pre-AF" option to conserve battery power. On A7 series cameras and A6300 the option is on page 3 under the "gear" tab.
    • Actuations of the electromagnetic aperture diaphragm and/or the focus motor of the lens result in noises which may be picked up by the camera's internal microphone during video recording. Use of an appropriately placed external microphone is required for video work.
    • The aperture moves in 1/3 stop steps with most Panasonic cameras and 1/8 stop steps with other cameras, which may be noticeable in video recordings. Programmed exposure mode and shutter priority exposure mode should not be used for video. Lenses supporting "smooth iris" smooth out the transition but do not increase iris resolution.

    Yet

    Phase-detect functionality appears to be limited to a very small central region. It means excessive hunting with off-center points, or Lock-on and Eye AF (both in AF-C) for non-central subjects. While AF in video is possible, it's slow with significant hunting. At this point, a7/R II and a6300 owners may find this update largely useless

  • Metabones customer service at its best *

    On 28 Jun, 2016, at 2:05 am, xxx> wrote:

    Dear Sir/Madam

    I have an S type speedbooster that is struggling to lock correctly onto the body of my GH4.

    A fast focus pull will unlatch the speedbooster with lens attached from the camera body it has become that bad.

    Can you suggest a remedy for this. I have compared it with another speedbooster and the locking pin hole is not as deep as the one which locks correctly.

    Any information would be greatly appreciated

    Steve


    Dear Mr. x,

    Thank you for your enquiry!

    Please provide your shipping address for our further processing, we will send a new bottom mount to you for replacement.

    The parts will be sent by normal air mail, it may take around 1-2 weeks.

    If urgent, you may consider to pay USD25, the parcel will be sent by Fedex.

    Regards Elsie GBI Ltd

  • Hi Sph1nxster,

    I have the same issue with the speedbooster for the BMPCC x0.58, I wanted to use it with the BMMicroCC, but it don't fit and Idon't want to insert it with force. I read on other forums that we can ask to Metabones a new bottom mount, thiner wich will be ok. Ca you give me the mail adress to write to please?

    Thanks.

  • PR

    Vancouver, Canada, June 30, 2016: Metabones® thrives on constructive criticism by the community and the press, and customer feedback was the driving force behind the fastest phase-detect autofocus (PDAF) across the widest selection of EF-Mount lenses on the Sony phase-detect trio (A7 Mark II, A7R Mark II and A6300) through a series of incremental firmware improvements last year, a feat that still held just as true with the release of “native” AF firmware last week. This accomplishment was the cornerstone of Metabones’ “Ubiquitously Fast Autofocus” vision, providing the broadest range of mirrorless cameras with fast still-photo single-AF when using adapted EF-mount digital single-lens reflex (DSLR) lenses. It began with fast AF on Panasonic launched in tandem with the 0.71x EF-MFT Speed Booster ULTRA last July, followed by fast AF on the Sony phase-detect trio and Olympus cameras last year. An EF lens on A7 Mark II, A7R Mark II or A6300 focused so quickly that it was virtually indistinguishable from a genuine Canon DSLR under some use-case scenarios. Nevertheless, Sony’s contrast-detect AF cameras such as A7S Mark II and early phase-detect cameras such as A6000 still took seconds to lock using an EF lens, and that remained the final frontier to conquer before we could lay claim to be ubiquitously fast. With Metabones “native” AF firmware, these other cameras got an order-of-magnitude boost in AF performance. “Native” AF was also an order-of-magnitude faster than Sony A-mount lenses on Sony LA-EA3 adapter on these non-phase-detect and early phase-detect Sony cameras. With the “native” AF firmware release, “Ubiquitously Fast Autofocus” was fait accompli and our vision had become reality.

    “Native” was an informal term referring to a different version of the lens communication protocol which unlocked extra features such as direct manual focus (DMF), Eye-AF (A7 series), fast contrast-detect AF (faster for all Sony cameras except the phase-detect trio), continuous video AF, zoom position and focus distance display. Metabones did not make any representation of further performance improvement for the Sony phase-detect trio of cameras from “native” AF. Quite on the contrary, our previous announcement stated that “native” AF might have lower performance than the original “Green” mode phase-detect AF, which had been the fastest since last year. There was no performance regression in the sense that the user could configure the adapter to have the old behaviour (“Green” mode) back with a simple procedure. Hindsight being 20/20, switching the default mode from “Green” to “Advanced” was a mistake, and we apologize to affected A7 Mark II, A7R Mark II and A6300 owners who were inconvenienced by this change. Based on your input, we are releasing a new Metabones App 2.4 (E-mount v52) with the default mode reverted to “Green” again. V52 cannot be safer to install because no new features are activated and there are no changes in operation without you first opting in. Users of Sony’s contrast-detect AF and early phase-detect AF cameras are advised to configure your adapter to “Advanced” mode using the procedure in the User Manual section of our web site (http://metabones.com/article/of/green-power-save-mode) to get a significant AF performance improvement. In addition, we have made “native” AF-C slightly better and added C-AF support for Olympus OM-D E-M1, although an AF-C performance bottleneck remains in the lens’ inability to execute a series of fine maneuvers with minimal latency as commanded by the camera body. Metabones App 2.4 is available immediately for download from Metabones’ web site. We will continue to listen to your feedback as we have always been, because your input sets the direction of our future development efforts on “native” AF technology using adapted DSLR lenses.

  • Metabones Speed Booster XL Review

  • New firmware

    • Name: Firmware update V0.54 for EF-E Smart AdapterTM MARK IV and EF-E Speed BoosterTM ULTRA
    • Release date: 16 Dec 2016
      • Fixed autocrop recognition of Tamron 18-270/3.5-6.3 VC PZD B008 as a cropped lens.
      • Fixed issue when "choose between OIS and IBIS automatically" is selected in Metabones App, Tamron 24- 70/2.8 * VC USD A007 would still be turned on in Green mode after an exposure.
      • Fixed issues with Tamron 150-600/5-6.3 Di VC USD A011.
      • Added an option in Metabones App to enable the use of Digital Zoom in Advanced mode.
      • Stability improvement
  • Metabones unveils 4 new products on the fifth anniversary of the original Smart Adapter. They are EF to E CINE Smart Adapter™, EF to E CINE Speed Booster ULTRA, EF to E Smart Adapter V and EF to E Speed Booster ULTRA II.

    The headline feature of EF to E CINE Smart Adapter and EF to E CINE Speed Booster ULTRA is a positive-lock EF lens mount carried over from the critically acclaimed Metabones EF-FZ CINE Smart Adapter, a perfect companion to the positive-lock mount of the new Sony FS7 Mark II camera.

    All 4 new products are equipped with a rubber gasket to protect the E-mount connection from dust and moisture. To promote ease-of-use, an LED indicates the adapter’s operation mode, optical image stabilization operation and communication status. A dedicated switch controls in-body image stabilization (IBIS) on Sony cameras equipped with SteadyShot INSIDE.

    EF to E CINE Speed Booster ULTRA and EF to E Speed Booster ULTRA II feature the same world-renowned Speed Booster ULTRA optics by Caldwell Photographic and WB Designs that make lenses brighter, wider and sharper. Metabones recounts the beginnings of the world’s first fully electronic EF to E mount adapter 5 years ago, with only aperture control and auto-magnify (requires lens with distance information) but no autofocus support back then. Over the years firmware work has significantly expanded its capabilities. Today, the very same original Smart Adapter, though long discontinued, can still be upgraded to leverage the latest firmware benefits such as smooth iris (lens support required), fast contrast detection autofocus on all E-mount cameras, eye-AF, direct manual focus (DMF), zoom and distance display (requires lens with distance information), assignable custom button and 5-axis image stabilization (requires camera support).

    Since the advent of the original EF to E Smart Adapter 5 years ago, Metabones has assumed a pivotal role in the mirrorless revolution. Cinematographers and photographers all over the world are armed with unprecedented flexibility of lens and camera choice.

    EF to E CINE Smart Adapter will be available in February 2017 for USD 449 plus applicable taxes, duties and shipping, and EF to E CINE Speed Booster ULTRA will be offered at the same time for USD 699 plus applicable taxes, duties and shipping. Availability and pricing of EF to E Smart Adapter V and EF to E Speed Booster ULTRA II are to be determined.

  • PR

    Metabones App 2.7 (E-Mount Version 56) is released today, adding support for the Canon CN-E 18-80mm T4.4 L IS KAS S lens to Metabones EF mount Speed Boosters and Smart Adapters.

    Servo zoom can now be controlled using the wide-tele zoom rocker on supported cameras (for example JVC GY-LS300), with a touch screen interface (most Panasonic cameras), or from PlayMemories Mobile App for Sony cameras.

    For supported Sony cameras, the Record button on the grip of the Cinema EOS CN-E 18-80mm T4.4 L IS KAS S lens can be assigned to one of more than 50 functions on the A7 series and other supported cameras. By assigning it to the MOVIE function, the user may start/stop recording and zoom with the lens’ hand grip which is handy for a small-form-factor camera like A7R Mark II.

    Whereas a typical EF mount lens changes the iris at 1/8 stop granularity, a Cinema EOS lens permits much finer control. Metabones takes advantage of this improved precision resulting in footages in which auto iris movements are virtually imperceptible.

    Autofocus is supported, but to set expectations properly, AF performance of a supported Cinema EOS lens on a non-Canon camera is significantly below that of a genuine Cinema EOS camera equipped with dual pixel AF technology.

    Never has any cinema lens received such comprehensive electronic integration across disparate lens mounts and brands like Blackmagic, JVC, Panasonic, Sony and of course, Canon Cinema EOS natively.

    Important notice: not every Cinema EOS lens supports every feature. At the time of writing only Canon CN-E 18-80 T4.4 L IS KAS S supports auto iris, autofocus and servo zoom.

    Also added to the new firmware release is support for the new Panasonic GH5 camera, with the usual set of features: user selectable optical image stabilization/5-axis in-body image stabilization (no dual I.S.), fast contrast detection autofocus (no DFD), smooth iris (requires lens support) and detailed EXIF.

    Metabones App 2.7 (E-Mount Version 56) is available immediately from Metabones’ web site. The same download upgrades every Metabones product with a micro USB port. See the accompanying release notes for compatibility and other important information.

  • New firmware

    • Added autofocus support during high speed and medium speed continuous drive (up to 10fps) on Sony A9 (“Green” mode only). Experiment with the “Priority Set in AF-C” setting for the best compromise between hit rate and frame rate for your shooting style. Overall performance depends on lens used. The camera does not use hunting while tracking is in operation. If subject movement exceeds the measurement range of the OSPDAF sensor, autofocus pauses. This is by design. The measurement range of the OSPDAF sensor decreases as the focal length increases. Except for the original Mark I Smart Adapter this feature is available for all subsequent Speed Boosters and Smart Adapters.
    • Enlarged PDAF area on supported cameras when adapter is in Advanced mode, with the advisory that AF performance may be unsatisfactory outside of the central portion of the frame.
    • Enabled AF illuminator (Advanced mode only).
    • There is an AF accuracy issue when using AF-S or DMF on Sony A9 and telephoto lenses with Metabones in “Advanced” mode, which affects this and all previous firmware versions. Green mode, which is set by default on Sony A9, is not affected (except for the original Smart Adapter Mark I, which does not support “Green” mode). A9 users are advised to not use “Advanced” mode but stick with the default “Green” mode. In addition, some telephoto lenses rarely exhibit this issue, such as EF 200/2.8L II USM, EF 400/5.6L USM and Tamron 150-600/5-6.3 VC USD A011. Investigation of this issue is still in progress.
    • Fixed AF issue with EF-S 10-18mm f/4.5-5.6 IS STM and EF-S 18-135/3.5-5.6 IS Nano USM lenses.
    • Fixed smooth iris support for 40/2.8 STM, 50/1.8 STM and Sigma 50-100/1.8 DC HSM Art 016.
    • Fixed CN-E 18-80 T4.4 L IS KAS S servo zoom used by the camera’s zoom rocker and the lens’ rocker in alternation.
    • Fixed CN-E 18-80 T4.4 L IS KAS S auto iris when adapter is in Green mode, where extremely bright conditions no longer causes the iris to close completely.
    • Fixed aperture display with Canon EF 300mm f/4L IS USM lens and Kenko Pro 300 teleconvertter.
    • Corrected W-T zoom scale display in “Advanced” mode for Speed Booster and Kenko Pro 300 teleconverter (except Mark I/II/III and original Speed Booster).
    • Faster aperture diaphragm for still photography in Advanced mode when Live Vide mode is set to Setting Effect OFF.
    • LED (if available) now shows solid magenta when adapter is connected to USB waiting for Metabones App to run.

    http://metabones.com/article/of/EF-E_Firmware_Win

  • The 3 generations of MFT Speedboosters explained by Brian Caldwell! -Found on the Facebook Metabones Groupimage

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  • @CFreak

    Most probably it is theoretical MTF from optical design app.

  • New firmware

    • Continuous video AF performance improvement (works in Advanced mode only)
    • Addition of a custom function to Metabones App which lets the user to configure video AF speed/smoothness/noise level.
    • EXIF improvement Improved operation with Kenko Pro300 1.4x and 2x (blue dot) teleconverters.
    • Fixed a rare phenomenon where an old model camera with Mark V, Speed Booster ULTRA II, CINE Smart Adapter or CINE Speed Booster ULTRA with the IBIS switch at the OFF position may leave the LED indicator on in blue.
    • In Green mode, you may now attach an EF Extender first and turn on the camera before attaching a compatible EF telephoto lens. In advanced mode, you must not leave the EF Extender without lens while the EF Extender is attached.
    • If you have an early production CINE Smart Adapter or CINE Speed Booster, the manual lens EXIF definition custom function (preset using Metabones App) will no longer activate automatically. Press the WO/CF button on the adapter to activate.

    Available at

  • I recently purchased the Metabones 'S' version (MB_SPEF-m43-BM2) for my GH2. I now plan to invest in some used lenses from eBay mostly for video. Guidance as far as brand and models would be awesome. Suggestions by persons who have used the lens with this combo is what I am looking for.

    I read through the entire topic and notice that the EF-MFT speed booster is only mentioned as coming out in June 2014 page 29. Then chinyew asks a question on July 2014 page 30. Then by the top of page 31 (September 2014) there is already talk of the Ultra coming out and excitement for a GH4 specific model which continues until the end of the thread.
    My point is there was tremendous excitement for the model then when it came out I guess people just used it and stopped commenting? Or they were just hyped for the next model? Not sure.

  • If I remember right, the 'S' version was made specifically to work with some Olympus models which had thicker sensor assemblies that were in danger of being scratched by the standard speed booster. That might explain why some people were excited about it. I think I have an 'S' model somewhere and it works fine with other cameras too.

  • PR

    To better support the new Blackmagic Pocket Cinema Camera 4K, Metabones® is making 3 changes: new firmware to enable autofocus, new optics optimized for the new sensor, and a new name for the existing BMPCC Speed Booster®.

    image

    Metabones® releases firmware version 3.1 today, adding autofocus support to Blackmagic Pocket Cinema Camera 4K. The intent is not to replace, but to supplement focus-pulling in cinematography. There is no continuous autofocus, but one-shot AF is activated by pressing the focus button on the back of the camera. It may take a couple of seconds or more to lock and if used during filming will cause visible disruption in the footage. Use it before recording commences and we recommend manual focus during recording.

    While most lenses can be powered by the Blackmagic Pocket Cinema 4K camera body, certain lenses such as Canon EF 85/1.2L II USM, Tamron lenses and Tokina Opera 50/1.4 (this is not an exhaustive list) may require an external 5V power source supplied via the micro USB port of the adapter because the camera body is unable to supply enough power to these lenses. When you shop for a power solution for your camera we recommend getting one with an auxiliary 5V output to supply the lens.

    There will be new Pocket 4k Speed Boosters® with new optics specifically optimized for the unique characteristics of the new Blackmagic Pocket Cinema Camera 4K. We will disclose details in a separate announcement. Each Speed Booster® is designed specifically for the filter stack of the sensor. The existing Speed Booster® XL 0.64x and Speed Booster® ULTRA 0.71x have excellent optical properties on JVC, Olympus and Panasonic cameras but the forthcoming Pocket 4K Speed Boosters will work only on Blackmagic cameras. Our existing EF-BMPCC Speed Booster®, designed specifically for the smaller image circle of the original (FHD) Blackmagic Pocket Cinema Camera, will continued to be sold, albeit under a new name, EF-MFT Speed Booster® SUPER16 0.58x, in order to avoid confusion with the new Blackmagic Pocket Cinema Camera 4K which has a much larger full-size Micro Four Thirds sensor. A rubber gasket is added to protect the connection between the adapter and the camera from dust and moisture. EF-MFT Speed Booster® SUPER16 0.58x works with all Blackmagic Design cameras with Super 16mm sensor size.

    Product Details: http://www.metabones.com/products/details/MB_SPEF-m43-BT7

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  • EF TO EOS M SPEED BOOSTER ULTRA 0.71X

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    Metabones introduces the latest member of its award-winning Speed Booster family of DSLR (digital single-lens reflex) to mirrorless lens mount adapters, EF-EOS M Speed Booster ULTRA 0.71x. Full-frame Canon EF-mount lenses are now one stop faster, 0.71x wider and with increased MFT (note 1) on Canon EOS M cameras. The 4k/UHD video crop on EOS M50 can also be mitigated with third-party APS-C lenses using this Metabones Speed Booster. Some Canon EF-S lenses may be modified to fit on the Speed Booster but Metabones cannot be held liable for any issues arising from modifications. Using APS-C lenses with Speed Booster for still photography or full HD videography may result in vignetting.

    Ever since the first Speed Booster was introduced, there have been DIY attempts to modify it to fit EOS M cameras. The turnkey solution Metabones now offers adds a number of refinements:

    • The optical housing is redesigned for perfect fit on EOS M.
    • The EXIF metadata is changed to reflect the faster aperture (note 2) and shorter focal length.
    • The autofocus speed of the lens is adjusted and optimized for the change in focal length and aperture to ensure the best performance. This is especially important for dual-pixel autofocus (DPAF) in video mode.
    • A 'chip' mode is added so that the user may store the metadata of a fully mechanical manual lens in the adapter.
    • A LED indicates operational status of the Speed Booster.

    Since both the lens and the camera speak the same protocol most features are supported with the exception of lens aberration correction, which is automatically turned off.

    Speed Booster ULTRA

    Speed Booster ULTRA uses an advanced 5-element/4-group optical design by Caldwell Photographic Inc., incorporating ultra-high index tantalum-based optical glass to achieve extraordinary optical performance with improved corner sharpness, distortion and reduced vignetting. Speed Booster ULTRA has a magnification of 0.71x, effectively reducing the crop factor of APS-C cameras from 1.5x to 1.07x. The Speed Booster ULTRA design makes very effective use of exotic materials at the furthest limit of glassmaking technology, and as a result is well corrected for use with virtually all full-frame SLR lenses regardless of exit pupil distance. Thus, the Speed Booster ULTRA performs extremely well with professional-grade f/2.8 zoom lenses such as the 24-70mm f/2.8 and 70-200mm f/2.8 zooms by Canon to produce 17-50mm f/2.0 and 50-142mm f/2.0 high-speed zooms, respectively. Similarly, high-speed fixed focal length lenses such as a 50mm f/1.2 will be transformed into a 35.5mm f/0.9 lens with excellent contrast and resolution from the center all the way to the edges of the image.

    Availability

    Metabones EF-EOS M Speed Booster ULTRA 0.71x is available right now for USD 479.00 plus applicable taxes, duties and shipping, from Metabones' web store and its worldwide network of resellers.

    Note 1: compared to the same lens on the same camera with an ordinary lens mount adapter without optics.

    Note 2: to ensure compatibility with hardware and software, which do not always handle sub-1.0 apertures properly, f/1.2 lenses will display their pre-boost aperture. Please rest assured that the display has no impact on the actual maximum aperture and a maximum output of f/0.9 is supported.

    Specifications

    • Product name (Model Code): Canon EF Lens to EOS M (EF-EFM Mount) T Speed Booster ULTRA 0.71x (MB_SPEF-EFM-BT1)
    • Product page: http://www.metabones.com/products/details/MB_SPEF-EFM-BT1
    • Dimension: 27.1 x 72.3 x 76.0mm
    • Weight: 192g
    • Retail Price: USD 479.00
    • Color: Black Satin exterior; Black Matte interior
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  • Speed Booster for Blackmagic Pocket Cinema Camera

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    Caldwell Photographic Inc. and Metabones are pleased to announce a new series of Speed Booster for Blackmagic Design Pocket Cinema Camera 4K (BMPCC4K).

    The BMPCC4K Speed Booster ULTRA 0.71x and XL 0.64x are similar to the standard m43 Speed Booster adapters, but the optics have been re-designed to optimize for the filter stack thickness of the Blackmagic cameras, which is substantially thinner than that of standard m43 cameras.

    The thickness of the camera's filter stack is an important component of the overall optical design, and the re-designed optics ensure that both versions can achieve the same high performance as the Speed Booster versions for standard m43. This is especially critical at the extremely large apertures made possible by Speed Booster technology.

    In addition to the new optical designs, the new series of Speed Boosters also features a longer tripod mount to perfectly match the height of the BMPCC4K camera body. This way the camera and the Speed Booster can be mounted firmly on the same quick release plate.

    Both versions -- the Speed Booster ULTRA 0.71x and XL 0.64x -- are available with Nikon G lens mount, with Canon EF lens mount and with Canon EF CINE lens mount. The ARRI PL lens mount is available in ULTRA 0.71x version only. The Canon EF CINE lens mount creates a positive lock for a secure electronic connection, and together with the matching length of new the tripod mount, allows for a rock-solid mechanical setup, which is important when using follow focus attachments.

    This new series of Metabones Speed Booster adapters is designed exclusively for Blackmagic Design Pocket Cinema Camera 4K (BMPCC4K). They cannot be attached to any other m43 cameras such as JVC, Olympus or Panasonic cameras.

    Metabones Speed Booster ULTRA 0.71x for BMPCC4K:

    The new Speed Booster ULTRA 0.71x for BMPCC4K uses an advanced 6-element 4-group optical design incorporating ultra-high index tantalum-based optical glass. The new design is specifically optimized to bring the same level of astonishing performance as the ULTRA Speed Boosters for Micro Four Thirds to users of the Blackmagic Pocket Cinema Camera 4K.

    In particular, the Speed Booster ULTRA 0.71x is optimized to correctly account for the BMPCC4K camera's specific filter stack located near the sensor surface. This is especially critical at the extremely large apertures made possible by Speed Booster technology. As a result of this careful optimization, an enormous range of full-frame optics, ranging from vintage film lenses to the latest digital designs, will function flawlessly when adapted to BMPCC4K bodies.

    The Speed Booster ULTRA 0.71x reduces the crop factor of the BMPCC4K camera as shown in the above table. The new design for BMPCC4K makes very effective use of exotic materials at the furthest limit of glassmaking technology, and as a result is almost perfectly corrected for use with all full-frame SLR lenses regardless of aperture or exit pupil distance. The Speed Booster ULTRA 0.71x will also work extremely well with many DX and APS-C format lenses, provided the image circle provided by the lens is large enough.

    Optical performance of the new Speed Boosters is so good that the MTF of any lens attached to it will be improved. Even the latest generation of ultra-high performance SLR lenses such as the Zeiss Otus series can be improved by adding a Speed Booster ULTRA 0.71x.

    MTF at 10, 20, and 40 lp/mm as a function of image height for output apertures of f/0.9, f/1.0, and f/2.0, respectively1. At the maximum aperture of f/0.90 (i.e., with an f/1.2 master lens) the sharpness and contrast are extraordinary across the entire image circle. At just one-third stop down to f/1.0 the performance is equal to or better than the best photographic lenses used at their optimum apertures. An additional stop down to f/2.0 yields performance that is rarely encountered in photographic optics. In practice, what all of this means is that the new Speed Boosters will always enhance and never degrade the performance of the attached master lens.

    And other aspects of optical performance haven't been sacrificed in order to obtain high MTF, either. There is less than 1 stop of corner illumination falloff even wide-open at f/0.9. There is no vignetting at all after the output aperture reaches f/2.82. Rectilinear distortion added by the Speed Booster ULTRA is negligible at less than 0.7%.

    Metabones Speed Booster XL 0.64x for BMPCC4K:

    Also this Speed Booster XL 0.64x adapter has been designed exclusively for the Blackmagic Pocket Cinema Camera 4K, with a magnification of 0.64x. The Speed Booster XL 0.64x uses an advanced 7-element optical design to achieve extraordinary optical performance at apertures up to an incredible f/0.80.

    The new Speed Booster XL 0.64x reduces the full-frame crop factor of the BMPCC4K as shown in the table further above. In addition, the speed of any attached lens is increased by 11/3 stops, with a maximum output aperture of f/0.80 when an f/1.2 lens is used. For example, a 50mm f/1.2 becomes a 32mm f/0.80, which is the fastest aperture available for Blackmagic cameras.

    Perhaps most exciting of all, in addition to increasing lens speed and field of view, the Speed Booster XL 0.64x offers amazingly high image quality even at extremely large apertures. Figures 1 through 3 below show MTF at 10, 20, and 40 lp/mm as a function of image height for output apertures of f/0.8, f/1.1, and f/1.81. At f/0.80 (i.e., with an f/1.2 master lens) the sharpness and contrast are extraordinary out to an image height of 5.1 mm, which is the limiting image height of the BMPCC4K camera's FHD video mode. Beyond 5.1 mm the performance drops gracefully, but remains very good even in the extreme corner of the full Blackmagic sensor. Note that as the master lens aperture is reduced to f/1.8 and then f/2.8 (corresponding to output apertures of f/1.1 and f/1.8, respectively) the performance improves everywhere, especially in the extreme corners.

    And other aspects of optical performance haven't been sacrificed in order to obtain high MTF, either. There is only about 1 stop of corner illumination falloff even at f/0.8. There is no vignetting at all after the output aperture reaches f/3.42. Rectilinear distortion added by the Speed Booster XL 0.64x is negligible at less than 0.8%.

    Just like the Metabones Speed Booster ULTRA 0.71x for BMPCC4K, the Speed Booster XL 0.64x is optimized to correctly account for the BMPCC4K camera's specific filter stack located near the sensor surface. This is especially critical at the extremely large apertures made possible by Speed Booster technology. As a result of this careful optimization, an enormous range of full-frame optics, ranging from vintage film lenses to the latest digital designs, will function flawlessly when adapted to BMPCC4K bodies. In fact, most lenses will have significantly improved MTF when used with the Speed Booster, compared to using them with a plain (i.e. "glassless") adapter on Blackmagic cameras.

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