Focal Reducers / Speed Boosters | Explained
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- Опубліковано 28 лип 2024
- 💭 Comment - Let us know what you want us to explain next below!
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Sources / Further Reading
www.metabones.com/assets/a/st...
www.sharegrid.com/learn/what-...
www.sharegrid.com/blog/posts/...
www.edmundoptics.co.uk/knowle...
www.edmundoptics.co.uk/knowle...
www.alex-stone.com/2020/10/29...
www.red.com/red-101/sensor-cr...
thedarkroom.com/film-formats/
briansmith.com/flange-focal-d...
www.cambridgeincolour.com/tut...
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Production Kit
Canon C200 (Piece to camera)
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RED Gemini (Studio B-Roll)
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CueScript EMC15 Teleprompter
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Sachtler Video 18 S2
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Sennheiser MKE600
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Zeiss Otus EF Set - 28, 55, 85
cvp.com/product/zeiss-2277-81...
Zeiss Milvus 100mm
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Nanlite Forza 500
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Aputure Light Dome II
cvp.com/product/aputure_69472...
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00:00 - Intro
00:11 - What Is A Focal Reducer
01:30 - How They Work
08:11 - Why Should You Use One?
11:14 - What Mounts Do They Come In?
12:08 - What Is Flange Distance?
Music - www.epidemicsound.com/track/9...
#FocalReducer #Speebooster #Mythbusting - Фільми й анімація
I think this is the best video about focal reducers on the entire internet.
I would definitely appreciate a similarly technical video on the "full frame look". Too often you see bs on youtube that attributes it to some magic qualities of a larger sensor, and it would be good to have a comprehensive reference of specific technical advantages of the larger format.
+1
+1
+ 1
Straighter angles at same field of view (wider field of view at same focal length), more light collected at same T-stop and ISO setting.
(Edit: hilariously I managed to write my short answer wrong... hehe. And yea great subject for a video)
@@randomgeocacher I agree with your second two points. Your signal to noise ratio with a large sensor is certainly improved over a small one at a given T-stop, allowing the same ISO to look less noisy.
I'm not sure I understand what you mean by the straighter angles thing.
A lot of us choose to not use focal reducers as they add glass. We feel that just adapting a 645 to a FF35mm is enough. This way you eliminate glass edge distortion. The best part of the lens is in the middle.
What an EXCELLENT video! I'm just chipping-in to wake the algorithm up to push it higher up the attention ladder. This is not only valueable to videographers but photographers as well - that table at 13:05 is a treasure! Thank you and cheers!👍
I wish this video would have been around when I started shooting. This is the greatest Video on the topic I've ever seen! Thank's for giving so much Information!
Absolutely amazing and easy-to-understand-explanation. Thank you! 👍🏼
I just discovered your channel, and it's great. There's a few things i want to say:
A factor that would enter into the equation of DoF would be the circle of confusion which is what makes that, with lenses that give both systems the same field of view (25mm for m4/3; 50mm for FF), a 1/4 of FF sensor like a m4/3 has not 4x the DoF of Full Frame, but only 2x. If you want to hear an explanation look at min. 4 of Filmmaker IQ's Hyperfocal video. I don't know how focal reducers affect circle of confusion.
The other thing I want to say is that it'd be great to see a video about the FF look you mentioned. I've found it very difficult to comprehend what are the things that differentiate a FF image from a crop sensor's with an increased aperture.
I've had my C70 and FR 0.71 for a few weeks now.
Thank you for this video, I now know it's science and not just magic that makes it work. :)
This is the best explanation so far I see, kudos to you, CVP!👍
Hey Jake. Amazing vid! Best explanation of focal reducers I’ve seen. Please make a vid comparing the Otus and Milvus sets! Thatd be sweet!! Thanks!
Great and informative video. More of these please, valuable information like this is very hard to come by. Really love the effort put into these. And it's very helpful for people wanting to know what products to buy for what reason. Keep up the good work.
Thanks David! Let me know if you have any subjects you would like us to cover & thanks for watching! Jake
Such a clear and detailed explanation. Thank you!
Im here to advocate the large format look video!
Thank you so much for a great video, stay safe and healthy my friend!
Thanks for watching Aleksand, you too! Jake
Thank you for sharing! What a great video!
This is really great and helpful! Thank you
This is exactly what I needed
I genuinely love this channel, one of the best channels for filmmakers.
Great Video = QUESTION - I have a RED Super 35 camera with an EF mount & I use EF Lenses, what would be the best Focal Reducer for this ? Please can answer this?
Thank you for the useful and informative video as always. Did you have any chance to try Sigma FF Cine lenses with the Canon reducer? Really appreciate your insight.
Great overview and lots of details!
I just wish there was an option to disable the “transformation” of f-stops and focal length, and just have the camera show what the lens is really set at.
I think the “speedboosting” of metadata is the cause of 99% of the confusion about speedboosters ... and primarily done to tout/market the capability of the device rather than being helpful to the operator. Especially when an adapter is semi-permanently screwed on it’s fairly obvious the operator likes to work with adapted lenses terms rather than the native mount terms.
The camera does show what the lens is really set at. The focal length and aperture really do change when using a speedbooster.
@@alex-stone I fully understand what compressing the image circle does. My point is that changing the metadata is not helpful to many users. For example, someone operating a speedbooster Super35 and a full frame camera at the same time for an interview, will only get matching settings incredibly hard. There are other situations too where it just make things harder. To many users it would be much easier if there was a camera menu option to disable the metadata transformation. Not to all users, but for some, it would really help.
For c70 owners semi-permanently screwing adapter into the body, I imagine several would prefer working in full frame terms.
@@randomgeocacher don't think of things in 'full frame terms' - a lens' focal length and aperture are independent of format size and are not relative to anything in terms of full frame.
By updating the metadata to reflect the actual focal length and aperture, this only makes it easier for the user - especially if their A cam is FF and their B is speedbooster S35. For instance, if the B camera now says 35mm, this will match the field of view that using a native 35mm on the A cam will give. Equally, it also helps match exposures - if both cameras read f/1.4, then the exposure is the same, even though the Speedboosted lens might now open up to f/1.0.
I used to shoot with an FS7 (with Speedbooster) alongside an A7Sii with manual lenses. Not having this automatic metadata adjustment made things harder as it added an additional step to have to think about when trying to match FoV and exposures.
@@alex-stonemy point is that the metadata thing is only helpful to one set of working and I think many/most do not prefer to work in that way. Regardless of how you want to work the best option would be to let the user decide. For me, I would like the metadata to say 70mm when the lens is set to 70mm. Sure I can try to compensate and reverse engineer in the head the difference, but the transformation just adds an annoying extra work and unclarity that I find utterly unhelpful. For me it could just say on the packaging how great it is and what it does, and then I would like to select “Do not improve metadata” in the menu. I’d rather buy native lenses than have to deal with the speedboosters making everything confusing. And given how many confused debates this metadata transformation adds to forums etc it seems it creates a lot of confusion / problems to many users.
Careful when you say you get a full frame look. When you use a focal reducer, you are adding glass to a lens and changing the actual focal length of the lens. A 50mm f2.8 lens becomes a new lens essentially with a focal length of 35mm f2 with a focal reducer. Therefore, you could just use a 35mm f2 lens without a focal reducer. I see a lot of misconception that a focal reducer will make your crop sensor into a full frame sensor and this is not the case.
Sorry Matthew but did you watch the whole video?
@@CVPTV Yes. I either misunderstood what you're saying, or it seems contradictory, for the section at 8:45 where you say "achieve a full frame look".
@@CVPTV Hey man, this video is truly fantastic. Thanks so much for the in depth explanation. I wanted to see if you could expand on Mathew's comment though. Is his comment correct? Would a focal reducer really not emmulate a "full frame look"?
@@joestaehly2427 a 50mm lens on 135 / FF has the same AOV as a 35mm lens on S35. But at the same Tstop, the 50mm on 135 will be 1.5 stops shallower in terms of DOF / back blur. Stop the 50mm lens down 1.5 stops and a 50mm lens on 135 / FF and a 35mm lens on S35 will look almost identical.
Add a focal reducer and mount the 50mm on a S35 camera and you move the point on convergence in the lens - so the 50mm becomes a wider lens, albeit with reduced image circle, one that now only covers S35. Using all the light captures increases the stop.
So 50mm (a standard lens on FF / 135) has not become a 35mm (standard lens on S35).
It doesn't really emulate
Great explanation, thanks
Thanks for this amazing video
wow finally busted the myth of hearing I can "emulate a larger sensor size" ive never thought of it regarding the FOV point
Thank you for the review. Now I'm completely confused. I get the focusing more light into the lens circle of coverage, thus the extra stop of light, but the rest was a nebulous black hole. Felt like a math test.
Hey Mark, if you are still interested in learning more about focal reducers I suggest checking out this white paper from Metabones - www.metabones.com/assets/a/stories/Speed%20Booster%20White%20Paper.pdf
Let me know if you have any questions. Jake
OMG i've lost you at half of the video! I hoped get an answer on the question: Is it better to use on à M43 à focal reducer on à vintage lens style helios 44-M, as i've seen someone do in another video? No maths please haha! Thanks! Good video by the way. Thumbs up!
Superb as is your support today on c70 hdmi. Is there a better reseller ? I think not
I'm attempting to adapt the Canon f/2.8 65mm 1x-5x MP-E onto an Olympus OM-D E-M1X. If I understand the video correctly, there will be no difference in DOF in either direction (increased or decreased), whether with the use of a straight EF-MFT adapter, or with an EF-MFT focal reducer, but the use of a focal reducer will recover one stop of lost light. Assuming that's correct, my biggest remaining question is whether or not the AOV and/or working distances will change with a straight adapter vs. a focal reducer. When mounted on a FF Canon body (such as my older 6D), the MP-E's normal working distance is rather shallow/small, particularly at higher magnifications. It would be beneficial to see those working distances increased to allow for more light, and more room for flashes other than a ring flash between the front element and the subject. Lastly, I'm wondering if models like the VILTROX EF-M2II, Commlite CM-AEF-MFT and Fotodiox Pro Fusion Redux Adapter are actually suitable alternatives to the significantly more expensive Metabones T Speed Booster ULTRA, or if they are underperforming in some way. Thank you in advance!
The Mamiya 645 and RB67 are similar. Can a speed booster made for the 645 be also used on the RB67 lenses if mounted on a dumb adapter?
9:06 ... Large format look. It's worth elaborating on this. Using longer lenses on larger sensors to get a wider fielld of view with less distortion.
Other factors, maybe the fall off from forcus to out of focus, etc...
If I bought a focal reducer for my Sony A7Rii to 645 lenses would one FR work for all MF lenses like the RB67 if used on the same camera?
I ha ve a question. How does the speedbooster works with cinema lenses. Did you still get 1 stop of light ? If it's a t2.0 lens how do you dial in the extra stop ?
Do super35 lenses mark focal length with crop factors in mind? So a 35mm super35 lens has the same fov as a 35mm full frame one?
Great video. But at 5:50 you mentioned that the f-number and focal length are cancelled out, so the DoF will be the same. However, from the formula, the focal length is powered by 2 while the f-number has no multiplication. Should the DoF change? Did I miss something?
I didn't get it either
looked like there was less green aberration on the bokeh when passed through the focal reducer
Does it work on my fuji gfx Mediumformat or what happens` with orginal lenses
Is there a EF lens to RF mount focal reducer?
Can focal reducers be used on dobsonians?
I modified the Mamiya 645 to PL mount then adapted them to the Kipon 0.7 PL to E mount for the A7siii. This caused a heavy vignette. Is anyone else trying to do this? Trying to figure out if the combo will work.
are there any reducers that just reduces the focal length and that doesn’t change the lens mount.
i am looking for a focal reducer to use with mft lenses on a mft mount. is there any? all i can find is focal reducers being together with mount adapters.
Afraid not, I would suggest watching the video fully if you have not already. Jake
How do focal reducers affect focus? I used an fs7 with a focal reducer and canon cine lenses and all the focal marks on the lens were out of whack.
This will be an issue with back focus on the adapter most likely. Jake
So a 50mm T2 on a full frame and a Crop sensor is still a 50mm T2, just cropped in. But a 50mm T2 on a Crop sensor with a speed booster is not the same as 50mm T2 on a full frame but changes the 50mm T2 to a 35mm T1.4? So for instance would a cropped sensor with 35mm T1.4 and a crop sensor with speed booster and a 50mm T2 would be the same look?
Yes a 35 f/1.4 on APS-C will look like a 52.5 f/2.1. The depth of field is the same. So those 2 lenses would look identical as long as you apply crop factor to both focal length and DoF.
Also if anyone tells you there is more distortion on the 35mm on APS-C, tell them it's false. All equivalent lenses have 100% the exact same look and distortion is a myth. A 12mm on m43 shooting at 3:2 aspect ratio will look 100% the same as a 24mm full frame when the image sensors are in the same plane.
Is it possible to mount a medium format lens to a GH5s body?
Yes, depending on what medium format lens you use, you can just adapt to EF and then use a 0.64x EF to MFT focal reducer. I've done this with some Mamiya lenses with EF adapters. Jake
can we pair Samyang Xeen CL PL mount lenses to Red Komodo with RF mount using a Focal reducer? if so then please tell me how it's done?
Do you mean the XEEN CF's? If so from memory you should be able to mount them with the Metabones PL Speedbooster. Metabones have a doc on their website which shows the max rear mount depth which I would check if I was you! Jake
@@CVPTV thank you so much Jake
good music. could you add track lists please?
Will do on future vids! Here's the track for this one - www.epidemicsound.com/track/9eQf4oogLP/
Can I use an E-Mount to E-Mount focal reducer? Somehow I can’t find them.
Hey, there is no E to E mount focal reducers. I would suggest re-watching the video as that could help you understand why E to E adapters aren't physically possible! Jake
would you happen to know if all ff glass on super 35 sensors paired with metabones 64 have vignetting?
It comes down to the lens, most will have light loss but hard vignette will depend on the lenses image circle. Jake
@@CVPTV what exactly is light loss? I’ve put my 35-150 ff tamron lens on and a rokinon 20mm ff on and at 20 and 35 they both have a slight vignette.
Great video, the only thing that I don't like on the C70 is showing the focal length as 35mm for 50mm lens. On a MFT system I always think of a 50mm lens as having a 100mm effective length, calculating the crop factor as it relates to the full frame equivalent of the lens used. Why wouldn't you then calculate the 50mm lens as a 50mm full frame equivalent when using the focal reducer?
Couldn't Canon have a menu setting to select when using the focal reducer that then sets the focal length on the camera as the full frame equivalent value as that is what is being achieved? I don't understand why you talk of the camera as 35mm when without the focal reducer you should refer to the 50mm lens as having a full frame equivalent of 85.5mm?
I understand why Canon have done it, just as they have changed the aperture by a stop too. It's because that is what the focal reducer is doing. I don't understand your 2nd question sorry?
@@CVPTV Doesn’t the focal reducer make the 50mm lens an equivalent 50mm full frame field of view and without the focal reducer the 50mm lens has an equivalent full frame field of view of around 85mm?
I understand why the fstop changes but wouldn’t it be easier to speak the same language around effective focal lenghts i.e full frame equivalent field of view?
Yes that is correct. No because focal length is separate to FOV. Jake
@@asiandetective4998 stop using full frame equivalent field as some form of base line. This is where the confusion is coming from.
ull frame equivalents do nothing but confuse and create a false baseline.
Can you speed boost a Sony Camera to Sony Lens to reduce F stop of Sony lenses you have?? Or is it always Sony to Canon / Nikon etc. lenses?
Its not possible I'm afraid. Jake
@@CVPTV ..thanks for the info.
... you're asking two things here, so the answer is a bit more convoluted. Canon to Sony or any interbrand adapters may or may not also be speed boosters. Is there a Sony E-mount to Sony E-mount speed booster - not as far as I know. HOWEVER, Sony inherited A-mount from Minolta - and there's whole plethora of A-mount/Minolta lenses, and YES there is (was) a speed booster for Minolta lens to E-mount body.
@@mack_solo thanks for that explanation to a weird newby question. It makes sense. Another answer is buy a G Master lens. lol
@@Voicewav Having a bigger wallet is always helpful, but not always possible. Sony cameras are pretty good for experimentation with other non-obvious and certainly not retail promoted options. Also "excellence" ages well in optics - the well regarded lenses of yesteryears may not match the top guns of now, but they will certainly beat the common entries of today at the fraction of the cost. Don't be afraid to give it a go :)
I would love to see Canon make an RF to PL adapter that uses the additional screw mounts like the .71 reducer does.
We need an affordable speedbooster for DSCM2 ...someone please capitalize
whats the best one for r5?
Is there any focal reducers for full frame? That would be if one is using medium format lenses on a full frame or aps-c I guess
As far as I am aware the only brand making them is Kipon. Jake
not sure about the definition of the focal length
Why's that?
Nothing for EOS (EF) only EF-M?
oh no, its not easy with a ursa12k..
👏🏾👍🏾🙏🏾
I don't understand
What don't you understand? I can try and help! Jake
Iij
Good info but hard to understand because of a lot of poor consonant articulation.
Great Video = QUESTION - I have a RED Super 35 camera with an EF mount & I use EF Lenses, what would be the best Focal Reducer for this ? Please can answer this? would this new canon reducer work?