Max, thanks for your great review! By the way, the micro usb connection and the jog dial on the speed booster are to allow cameras that cant power the lens properly to still manage aperture control of the lens. This is done by supplying external power to the speed booster via the micro usb interface and then using the jog dial to adjust the aperture manually. You wouldn't need to supply power to the speed booster externally if the speed booster supports power and control pass through, such as is does with the GH4... Hope that helps!

I purchased the Metabones Canon EF/ Micro 4/3 Speed Booster XL-BL from B&H Photo in April of 2016. My application was using the Panasonic GH-4 and the Speed Booster with the many Canon lenses I had accumulated. The unit worked well most of the time, but the GH-4 would occasionally show the “Lens attachment failed” error screen when I attached a different lens. I thought it was the lens choice, but noticed that all but one of the lenses I had were original Canon units. On 09/29/2016 the GH-4 firmware was updated to version V25 and the Speed Booster interface problem began to occur much more frequently. I continued to think it may have been due to my inexperience with the GH-4 camera functions, so I tried to learn about and attempt almost every combination of camera and lens settings. Nothing worked. On 12/07/2016 the Speed Booster firmware was updated to version V2.5, and on 12/08/2016 the GH-4 firmware was again updated to version V26. Now EVERY lens I try to attach gives the same attachment failure error message. I can only use the combination if I place the lens inside the Speed Booster mount but only turn enough to secure it without actually connecting the contacts of the lens and the Speed Booster. Of course this won’t allow any lens communication with the camera, but will still allow the use of the lens as a completely manual unit. I have tried both the Green Power-Save mode (default) and the Advanced Manual Focus mode on the Speed Booster and I still get the same results. I find it almost unbearable that I purchased this unit mainly for the ability to use my Canon lenses on the GH-4 like I use them on my Canon bodies, i.e. with full control of the lens focus functions. I can’t believe a $650 unit designed to do this, heralded as the best unit of its type available in the marketplace, only lasted for a few months before failing completely. Of course I am beyond the 30 day period usually given for a return window. I could never give this unit more than one star, and would seriously love to give it much less than one star, if that were possible. I have never been as disappointed with a seemingly serious photography product as I have been with this Metabones unit.

The wheel on the side is for controlling your lenses aperture when you have a camera that can't. You have to power it through the USB below it.

Great video Max, and great to see you such a proactive response to so many questions...here's one for you: Do you know what the image quality of the tamron 17-50mm is like compared to the panasonic 12-35mm? I have the panny but would like to build up a more versatile lens collection. Keep up the good work!

This review was super helpful. The mathematics part really helped me understand the benefit of this adapter, and now I'm not confused at all, which I was prior to watching your video. Thanks Max for all your hard work! - Paul Harwood

Nice job on this. I'm learning about how to shoot with my GH4 (and how to shoot in general) and it's not easy. Your tutorials are very helpful. Thanks!

at 16:42 you forgot the m43 crop factor. This would mean the Tamron lens you wrote turns into a 24-70, not a 12-35, although in actual fact that tamron lens is an APS-C lens, which is not supported by this adapter, so it wouldn't work at all.

This is like the 3rd time I come watch this video to learn how to do this little math for my speedbooster... I am so dumb! Thanks again Max... I already favorited this video just in case I forget again hahaha you the Best!

On their website it says that autofocus is supported, so maybe they updated it. What's currently not supported is AFC (continuous AF) and AFF (flexible AF) and video AF for Olympus.

This literally answered every question i had!!! Getting the gh4 with ef metabones ASAP! :):) thanks so much!!

I have a Canon 1D x mark II and would like to know, will metabones make a canon speed booster with EF mount on both sides? Could you ask them? This will eliminate the 1.4 crop ratio and brighten the image a lot! For video 4k production!

Max Yuryev , on the Metabones website, it says the EF Canon to 4/3 is not compatible with the Tamron 17-50mm. It's the only lens they list on there that says it is not compatible. Have you or anyone else used it with the speedbooster? Is there a way around it? Can't seem to find this answer any where on the web.

I bought this thing and tried it yesterday with the TAmron 17-50. AWESOME! Went to 2.0. However, It's HARD as hell to put on at first. Wish it came with a manual.

The Best explanation of the Metabones Speedbooster wow !! You got me sold, D-E-F-I-N-I-T-E-L-Y a must for the GH4 :) 

that little 'jog dial' - from their site: "Can use jog-dail button to control aperture when using external power supply. " So, without any external power supply, it has no use....

With the new firmware update (you can update the firmware of the speedbooster with a USB cable) now you get autofocus!

Keep doing these videos please! These are very helpful! Subscribed.

I ended up getting this for my GH4, but the control on the aperture control placement on the speed booster is a bit annoying.

Was thinking of getting the Canon EF 24-105mm F4 before you mentioned the tamron. hmm I'm stuck now

So,i bought the Metabones SB for Nikon,Sigma 18-35 mm for Nikon and Gh4 since i didnt know wha the difference between the canon and nikon speedbooster.You said cant use any 200mm with it? Im now discourage about what i have.I am self studying right now to do wedding videos in the future

thanks for the video!! Helped me understand the speed booster a lot more! Thank you!

One question that I didn't understand very well: the metabones has image stabilization or you are using the IS of the 70-200 lens?

FYI, the new Speedbooster XL with the 0.64x crop (GH4 has a 2.3x additional crop in video), so for video, lenses actually become 35mm equivalent to... Canon 16-35 F2.8 L -> ~ 23-51 F1.8 Canon 24-70 F2.8 L -> ~ 35-103 F1.8 Canon 70-200 F2.8 L IS -> ~ 103-294 F1.8 IS The older version in this video with 0.71x crop is: Canon 16-35 F2.8 L -> ~ 25-57 F2.0 Canon 24-70 F2.8 L -> ~ 39-115 F2.0 Canon 70-200 F2.8 L IS -> ~ 115-326 F2.0 IS

Why do they make it 4/3 and not just mirror less full frame? My lenses turn to zoom lens :/

i have a tamron lens 24-70 canon mount, is speed booster works with that lens to the gh4? thanks!

Thanks for the explanation good to see the actually maths. Just to understand it correctly - coming from a Canon 650d or 1.6 crop factor.....using a speedbooster with a 28mm or 85mm lens on the GH4, shooting in 4k, would essentially act almost the same as the equivalent 35mm focal length on a 1.6 crop sensor? So with your calculation a 28mm x 0.71 x 2.3 = 45.72mm on the GH4 4K. Where it acts as 45mm (equiv) on 1.6 crop? Basically shooting 4K with speed booster makes lenses act like 1.6 sensor??

Thanks, very informative indeed, feels like a teacher lol, btw hows the 3rd party lenses on Sigma/ Tokina is the autofocus brought over and supported by the Canon metabones?

Hey Max, thanks for the effort . I personally prefer a micro four thirds native lenses, thanks again.

on crop its 1.1x crop but on m43 what would it be ? 1.5x crop ? or 1.3x

Hey Max check out Tom Antosh video where he explains function of micro USB port and wheel dial. It should be for adding power to lens and dialing aperture in case contacts didnt work with body. Dont know at which combination of body and glass this can happen. Anyway thanks for very good explaning video!

what the different about "Canon EF Lens to Micro Four Thirds Speed Booster" and "Canon EF Lens to Micro Four Thirds Speed Booster S" when we use with panasonic gh4 ?

Thanks for the explanation. I'm gonna get that speed booster. :))

Hello Max, great video, i just subscribed , now i understand more about metabones, one question please!!! i have a Canon EF 25 - 105 and i want to know how mm will have on a gh4 with the Metaboone Speed Buster. Tell me if i am wrong please. 25 x 0.71 = 17.75 (x 2.3 = 40.8 [4K] 105 x 0.71= 74.55 (x2.3 = 171.4 [4K] So , mi canon lens 25 - 105 will be with the metaboone a 40 - 171 mm ????? PLEASE SOME HELP

Brilliant video :) Fills me with confidence to buy the GH4 - you mentioned the speed booster helps with low light? How does it do that? Thanks again!

hi Is there any special setting on gh5 cuz my adapter (XL) doesn't work and i don't know why ?

Thanks man, I needed this review

Hi Max! is that the latest speed booster released today? There is an ULTRA and a speed booster with a "s" on it....confusing.

Does the autofocus Work with the speedbuster?

Is it true about no autofocus?

Quick Question - Im thinking using the EF Canon 35mm f1.4 & The speedBooster 0.71 on my MFT G7. I already have the Panasonic Leica 25mm f1.4 which is nice. But Based on this calculation Will the Canon & Speedbooster let in more light than my Pana Leica? and ultimately give me even stronger background blur & DOF?

Does anyone know if there is a speedbooster for native m43 lens? (m43 to m43)

hi. sorry. i know, is a old video, but i have a question. if i have a canon 24/105 and i put the lens on this camera(gh4), which is the final crop?

does your IS stays 'on' also all the time?

Great info Max...just wondering if this works w/ any M43 like the Olympus too or just Lumix. Thanks

Did they end up releasing a firmware update for AF support for the EF? I am picking up a GH4 and this bad boy probably as well. I do see there are two different versions of this that have about a $250 price difference. What's the major difference there? And I guess, what's a good option for a telephoto lens to get super good distance while maintaining great quality at an affordable price to pair with the GH4 and MetaBones EF?

Can I use it with BlackMagic's Studio Camera 4K?

I'm pretty sure your calculation of metabones crop reduction is wrong - about 15min into video. Adaptor reduces the crop but doesn't reduce it beyond the original mm of the lens. So if the normal crop on four thirds camera is x 2 the 11mm would have field of view of 22mm and the metabones would reduce that by .71 to 15.62mm. Similarly 16mm crop factor would result in 32mm field of view with adapter bringing it back to 22.72mm. so your 11-16mm zoom in micro four thirds would have field of view of 22-32mm without adapter and 15.62-22.72mm with adapter.

Hi Max, good day, i wish to know why the 17-40mm Ultra Wide Angle Canon EF lens doesn't work properly with this speed booster. we dont get that wide angle we get on the 5Ds

@Max Yuryev, I really want to get the Gh5s for its low light, image quality, and the 4K 60p. I am ok with manual focusing and I wanted to solve the lack of image stabilisation by using Tamron G2 lenses that have really great optics and VC. Have you ever encountered anyone who ever used that combination with no issues with the VC?

Max Yuryev thank you for the excellent video. i believe i heard correct when you said i can control aperture from the gh4 with my canon lenses, is this true? i was almost ready to sell all my canon lenses, and this video made me realize i can keep them all until i'm able to get better glass. (kit lens, and a few other manual ones.)

Hey Max, really enjoying your videos. I've looked all over the web and nobody seems to know the answer to this question. I’m going to be using a Tamron 24-70mm VC lens with the Metabones Nikon G to Micro Four Thirds Speed Booster. At the other end is a Panasonic GH4. Do you know if the Vibration Control still works with the metabones adapter?

The Tamron 15-50 is a cropped sensor lens right? So does that mean that after getting the magnification (12.07/35.5) Do I have to multiply it by 1.6 to get a full frame equivalent? (19.32 / 56.8)

im trying to understand the difference between the metabones nikon mount and canon mount. is their a significant difference in image quality or is it the exact same? what are the disadvantages of having the nikon mount passive/not active?

Brilliant explanation video, Max :-) :-) :-)

thanks for the review, is there an adapter that has autofocus as well as aperture control for canon on MFT?

I am confused about your conversion. The way I understand it, the speedbooster is supposed to capture the entire FOV of a 35FF lens and focus it to the target size. Yes, one gets a 1 stop improvement because of this. But in terms of image size, I thought that if your 50mm has a FOV of 46 degrees in 35FF sensor, with the speedbooster, it should project that 46 degrees into a smaller sensor. So, once should have that same 46 degrees FOV for the m4/3. It does that for the aps-c speedboosters. I expected the same thing or m4/3. Why do you have to do all that math then? Now, I understand that once you shoot video, especialy 4k, the sensor does crop so that's a given. You won't retain the 46 degrees or 50mm FF POV. You'll lose when the sensor is further cropped shooting video (except maybe in the new GH5). But in photos, the entire m4/3 sensor should receive the the same FOV of any 35FF lens. There shouldn't be any more computations done as you have done. Mind you, I refer to FOV not focal length, because at the end of the day, it's really the FOV. That avoids the focal length conversions and confusion. Please clarify this for me. I know that in the aps-c speedbooster this happens. A 50mm 35FF FOV (eg. 46 degrees), will be focused on the target smaller aps-c sensor and retain that 46 degree FOV. In effect, the aps-c will see the same FOV as a 35FF sensor and since the light is focused into a smaller sensor (reverse tele), the bonus is a 1 stop advantage. Is the speedbooster working differently with m4/3 speedboosters?

Yes, very helpful! Thank You.

the aperture have to be multiplied by the crop factor also m8

Does this work work the g7 also does auto focus work

What is the difference between metabones adapter & speedbooster ? what should i buy adapter or speedbooster ?

But Max these two examples is of to APS-C lenses! Aren't you supposed to divide by 1.6 to get the right full frame equivalents? And after that do the math that you did? Or am I thinking completely wrong? Because if you take a full frame for example 16-35 F4 and calculate the focal length and then compare the 16 in the tokina (11-16) and the 16 in the canon (16-35) the 16 wouldn't look the same? Because the tokina is an APS-C and the canon is an full frame?

Thanks for a good video. Have you compered the Metabone to the Viltrox EF-M2 Auto Focus Adapter Speed Booster? The Viltrox is much cheaper but is it much worse? I have the Panasonic gx8 and I want to use some good canon or Nikon lenses with long focal length E.g. canon 70-200 f/4 or f/2.8. Thanks! /Jon

Anyone know if the Canon EFS 17-55 has vignetting or not when used for photos with the speedbooster? .71x speedbooster specifically. thx

hello how can i set up Canon lens on Metabones Speed Booster auto focus for video mode thanks

Ok, using a Tamron 17-50 instead of the Panny 12-35 looks nice on paper. But what about focus speed and accuracy? And optical qualities? The speedbooster certainly deteriorates IQ in some ways. There's much more to a lens than just aperture and range.

Max do you try the metabones Mark V for the a6500 i just bought the a6500 and for your review i bought the 50mm 1.4 zeiss (vs the rokinon) but i have the 18-35 1.8 sigma and i dont know if the News metabones works better than mc-11 and i dont find a review on KZfaq

thanks a lot for the review.... very helpful.... it's possible use the function pikin focus with this adapter? thanks again

Superb and very informative video. Just subscribed! Mind if I ask a rather random question... I'm looking to get a wide angle lens for my GH4. I have the metabones EF to MFT speed-booster, I have a Canon EF 50mm, and a canon EF 24-105mm. Do you have any recommendations that would complement my kit? I wonder if I should stick to Canon. I'm not sure. Either way, I need to use it for run & gun documentary work. Would be grateful for any advice!

Thank you. Very informative.

Max, I'm trying to find this Metabones but no store carries them, not even the Metabones site.. The link you sent tells me it has to be ordered and I have to wait till they get it in stock. B and H has a waiting period too, and Samy's Camera just doesn't have it. Where can I get one of these if I want it now? I'm shooting a short on my GH4 in 3 weeks and I really need this to showcase the new set of Leica r lenses I bought.

Does autofocus work with the speed booster when filming video?

When setting the F-Stop on the speed booster, does it have to be the same as the F-Stop on the camera?

hi! i need a metabones speed booster for my canon 70d. I want my canon 70d to looks like a full frame, not aps-c. is there any metabones version for aps-c canon using both canons lens and others brands?

My speedboats isn't tight on my GH4 is that with everybody? is that normal? like it wiggles a slight bit

Hi, Would I be able to mount fd lenses with an ef/eos adapter on the speedbooster?

Hi Max, hope you can help. I am interested in the Panasonic GH5, but coming from Nikon APS-C, I would like to keep on using my Nikon/ Sigma lenses. Now, if I understood right, only Canon lenses are fully able to communicate with the Metabone, but not the Nikon lenses, when it comes to autofocus, aperture etc. Can you confirm this? Otherwise I probably need to go for a D500 although the video mode does not convince me at all. Cheers,

thank you for your information!

Thanks a lot Max!!! I have one question. In terms of price, would you recommend me to buy the smart adapter (I don't think I'll need that extra stop) but what happens with the FOV? Take care and keep it up!

Hi do you get autofocus for video recording with the GH4 as nearly all the videos on KZfaq they use the GH4 to test this adapter but mention nothing about autofocus for video work being that GH4 is mainly used for it's video capabilities ?

Hey Max, quick question. I know it's been a while since you made this video but please give me another example of a bargain lens (Like the Tamron 17-50) for the Panasonic 35-100...

Hi Max Yuryev Thanks for the review! I'm asking this because it's not precised on the metabones official website that all canon EF lenses work with this speed booster. They've tested on a few lenses only. Do u know if it works with all canon EF lenses? Which lenses have u tested yet?

Nice and impressive

Hey how's the autofocus with the speed booster? Does the metabooster increase magnification (70-200) on H4 with the metabones is equal to what range?

Hey max! Quick question! I understand the speedbooster allows you to control the aperture on the lens, but can you also adjust the shutter speed?

Do you know if ef-s kit lenses will work with the speedbooster? I can only afford the gh4 with the speedboster. But I only have a Tokina 11-16 and a 50 1.8 would love to get the sigma 17-50 with it but not in the budget. Thanks.

Hi Max, great thanks for all those videos which help me a lot with my futur choices. I'm director and make most of the time documentaries, shootings with the camera on my hand. I am thinking about buying a GH4R or maybe wait the GH5 if it resolve some of my doupts. My interrogation is about the Image stabilisation. The absence of I.S into the GH4 is for me a big problem. I understoud the crop and +1 lighting interrest of the speedbooster but, on your video, I am not sure about the I.S aspect: does the speedbooster is an I.S for any kind of lens or does only permit to transmit to the GH4 the I.S of non-native lens ? I suppose it is the second case, it is not very clear.. I would like to use, in my ideal, some vintage and cheap lens (I have some FD canon and FM Minolta) but I am affraid that, inspite of speedbooster my futur shootings shakes a lot without tripode or steadycam. What do you think ? did you made some test with vintage lens + adaptator + speedbooster + GH4 ? One last question: did you made a comparaison beetween Metabones SB and the Zhongyi Lens Turbo ? It is very cheaper and some test show it is not so bad...What is you opinion? Thanks again for your helping involvement !! Greg

so you put that it is a 12.07-35.5 on the tamron lens (originally 17-50mm) but wouldnt it be 25.4-71 (if you filmed in 1080p)? i guess im not grasping which one it is because this makes a HUGE difference to me as far as what lens im getting. Along with that i was about to buy the gh4 along with the Nokia speed booster until i saw this video. Now that i've seen this video and since i have a canon t3i it would probably be a better option to get the ES speedbooster and use the lenses i have right? I have a tamron 10-24 f 3.5-4.5, canon EF 50mm 1.8, and a canon EFS 55-250mm F4.0-5.6. Im thinking of dropping the Tamron and getting the tamron you were suggesting since i do weddings like you and work in low light but i just need to make sure that this crop factor will give me something similair to the lens i use on my T3i. Just let me know what you would do in your situation. Also I AM USING ALL YOUR LINKS TO BUY MY STUFF because of how helpful you have been through this whole process. THanks a TON MAX!

Adapter looks nice. Have one question... I own also the Tokina 11-16 for my nikon d5200 and use it mostly for video. I'm planning to buy the GH4, but since I'm filming on a glidecam autofocus is 'realy' important. But the tokina is realy wide, so is it difficult to keep video in focus on the GH4? Hope to hear from you!

Hi Max ! Should i get a Metabones speed booster for my GH4 and start investing on Canon lenses or stick to panasonic lenses. I currently have a 12-35 f2.8 and was planning to buy 35-100 f2.8 soon. What should i do ? Thanks !!

I have a question, and I really thank you in advance if you can help me with it I've seen a video shoot with GH4 plus Metabones speedbooster MB_SPEF-M43-BM1and Sigma 18-35mm f1.8 my problem is that such Speedbooster is discontinued, so each one replace that old one ? there is a few but I am lost to be honest Thank you very much

Does the Canon EF - M43 work with the Sigma 18-35mm?

very good

is there a speedbooster that makes micro 4/3 have a full frame sensor field of view???

So my 24-105mm f4 will be f2.8!!?

Hi Max, any information about wether the speedboster xl will work just fine with the gh5?

if it does does the widen the angle hows the IQ on the edges?

Can I use this speed booster for GH3

Hi Max, thanks for the video, could you please give me you the link of the Tamron lens? ... I have a panasonic GH4 and was about to buy a Panasonic 12-35 lens ... you recommend? greetings from Ecuador ...

i think i may have to start selling my panasonic lenses :( and my gh3 for a 70d so i can finally get some good photography done and still have my gh4 for video.

good stuff!