This is another short note about the incredible possibilities of modern photographic equipment. It can be considered an addition to the article about 'autofocus lens 40/0.8 and manual 40/0.75', as well as an addition to the article'autofocus Speed Boosters for Sony E, FujiFilm X, Canon M, Nikon Z and Micro 4/3'.
Record values of aperture
The essence is very simple: owners mirrorless crop cameras with Sony E, FujiFilm X, Canon M and Nikon Z mounts can now get autofocus lens with a breathtaking combination of focal length and aperture: 35 / 0.85.
For this you just need:
- SPEED BOOSTER (speed booster) Viltrox Canon EF -> Canon EF-M 0.71X (or any similar), in stores its cost is about 150-200 $
- Original lens Canon Lens EF 50mm F1.2L USM, in stores, its cost is about $ 1500
A bundle of such a speed booster and a lens will give a set of 35.5 mm focal length (in the title of the note I rounded up to 35 mm) and a relative aperture of 1: 0.852 (in the title of the note I rounded up to 0.85). These numbers are very simple: 50 * 0.71 = 35.5 and 1.2 * 0.71 = 0.852.
Going even further and finding rare and old Canon EF Lens 50mm 1: 1.0 L Ultrasonic (about $ 4000 in the secondary market), then together with the speed booster Viltrox Canon EF -> Canon EF-M 0.71X you get a set of 35.5 mm focal length and relative aperture 1:0.71.
But that's not all. If you go a little further, and find the same rare and old Canon EF Lens 50mm 1: 1.0 L Ultrasonic, then together with the speed booster Metabones Canon EF -> Blackmagic Design Super-16mm sensor 0.58X (about $ 700) you get a set of 29 mm focal length and relative aperture 1:0.58... Fascinating numbers! At the same time, I repeat, autofocus and aperture control will work, and in EXIF the already recalculated focal length and aperture values will be transmitted. F / 0.58 is very powerful! True, the speed booster itself has its limitations and real aperture such a bond will be significantly lower (most likely at the level of T / 0.7-0.8). Who knows if it's possible to get more luminosity for reasonable money?
Let me remind you that of the modern high-aperture lenses that are available on the market, the fastest is the manual (without autofocus) Voigtlander SUPER NOKTON 29mm F0.8 Aspherical (about $ 2000) and it is only suitable for mirrorless cameras of the Micro 4/3 system with crop factor Kf = 2.
Materials on the topic
- Full frame mirrorless systems... Discussion, choice, recommendations.
- Cropped mirrorless systems... Discussion, choice, recommendations.
- Cropped mirrorless systems that have stopped or are no longer developing
- Digital SLR systems that have stopped or are no longer developing
- JVI or EVI (an important article that answers the question 'DSLR or mirrorless')
- About mirrorless batteries
- Simple and clear medium format
- High-speed solutions from Chinese brands
- All fastest autofocus zoom lenses
- All fastest AF prime lenses
- Mirrored full frame on mirrorless medium format
- Autofocus Speed Boosters
- One lens to rule the world
- The impact of smartphones on the photography market
- What's next (smartphone supremacy)?
- All announcements and novelties of lenses and cameras
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Material prepared Arkady Shapoval. Training/Consultations | Youtube | Facebook | Instagram | Twitter | Telegram
No, well, RF lens by :)
Also, as far as I understand, we get +1 T-stop, namely the relative aperture (in the context of DOF) remains the same. That is, for example, a Canon M50 with a speedbooster gets a crop factor of 1.6 x 0.71 = 1.136. This means that a class 50 / 1.8 lens will turn into 57/2 in EGF / equivalent depth of field, but the real aperture will be 1.2.
Without any confusion with these fr / ethers, the following would be:
With the speedbooster increasing the aperture by a stop, the abstract 50/2, installed with the speedbooster at m50, will become similar to the 35 / 1.4 installed at the same m50, both in depth of field and in aperture.
What is confusion and what is not is very relative, each is more comfortable with his own)
But don't forget about the 1.136 crop factor. Since if you take it into account and take your approach, then it turns out 40 / 1.6 with a real aperture of 1.4.
Where did you get this crop factor?))
I clearly wrote - a speedbooster that increases the aperture ratio strictly by one stop.
the increase in aperture depends specifically on the used booster
Our discussion took place in the context of EOS M. All speed boosters I know for M have a multiplier of 0.71, which, taking into account the system's own crop factor, gives the same number.
But on systems with a crop factor of 1.5, such speedboosters will give exactly a full frame.
Okay, a 50 1.8 lens mounted on eos m through a 0.71x speedbooster will give a similar aperture and depth of field to a 35.5mm lens with a f / 1.28 aperture when mounted on the same eos m.
As for RF - nothing is clear, what does it have to do with it?
Yes, ED, EGF + - changes slightly, but the real aperture ratio (T-steps) grow
I mean that through a speedbooster you can connect optics from a mirror system, usually EF, but in the article the very first mention of an RF lens.
Sorry, fixed (accidentally wrong)
For the foreseeable future, I will have a speedbooster for EOS M.
Does it make sense to prepare a review? With the participation of both autofocus optics and manual.
Yes, of course interesting
At one time I did something similar, experimented, but in a non-autofocus version. Because I was looking for more budget options, of course.
I put it through the booster Ricoh 55mm f / 1.2, Revuenon 50mm f / 1.4, Samyang 24mm f / 1.4.
Accordingly, something like ~ 40mm f / 0.85, ~ 36mm f / 0.95, ~ 17mm f / 0.95 came out.
An interesting thing to have some fun, to get a narrow depth of field, as in a full frame. But I wouldn't spend a lot of money on this. Optimally, in my opinion, a cheap 50mm f / 1.4 with manual focus is set.
You can generally forget about the Canon EF 50mm f / 1.0 L, this is something from the category of theoretical. Collectible, rare and super expensive. Easier to buy the new Mitakon 50mm f / 0.95 Canon EF manual focus.
Another interesting scenario is the use of such adapters on Micro 4/3, coupled with fast telephoto lenses.
For example, 300mm f / 2.8 turns into 200mm f / 2.0. That on MFT cameras with a good stub and a decent EGF will give a very interesting tool for bird hunting.
Or a cheaper 200mm f / 2.8 will give ~ 140mm f / 2.0. That on the MFT turns into a 280mm EGF also with a relative aperture.
Thank you
I used a Viltrox 0.71x speed booster Nikon F - Micro 4/3 with a Nikkor 300mm f / 4.5 telephoto lens. The result is a 210mm f / 3.2 lens. The picture is sharper with the adapter. I tried this lens for detailed panoramas. An example of such a panorama: https://commons.wikimedia.org/wiki/File:Парковий_пішохідний_міст_-_детальна_панорама.jpg
I have been shooting for 2 years already on a Sony a6500 with Canon FD full-frame optics and speedboosters. Not a photo shooter, I won't tell you the exact numbers.
The focal length of 50mm turns out to be about 53-55mm at the crop (compared the angle with 50mm without a speedbooster), it grows almost by a stop aperture, that is, in reality, instead of 800, you can put 500 (at 50mm native, with the same hole, 800 is needed), the sharpness increases in center, it can be seen just with the eyes, and the edges are slightly pooped. Which is not critical for the video.
The main + is the ability to keep the iso in the video below. Well, 28mm does not become 40, this is all described for the video.
Thank you
Specify, your 50mm speed booster becomes even narrower than without a speed booster, with the same camera and lens, do I understand you correctly?
At least the phrase “50mm focal length turns out to be about 53-55mm on the crop (compared the angle with 50mm without a speedbooster)” can be understood just like that.
Yes, it seems like the theoretical limit of the relative aperture is 0.7, so 0,58 will not work.
Theoretical limit 0.5
I shot a lot with a bundle of NEX-3N + LTII, including in pitch darkness.
From published: https://www.flickr.com/photos/curry-hexagon/albums/72157695822810061
After the booster, the desire to use old lenses on a crop without a focal compressor disappears.
There is no sense in trying to hoist 50 / 1.2 on the LTII.
If you dwell not only on the formal parameters of optics, then as a system for a very tough low-light, the FF + 50 / 1.4 combination will come out better in aggregate.
there is one bold but - for speedboosters it is not recommended to use lenses lighter than 1.7, since they are soft and everything ... but someone likes software and here each bunch will be very different
Not so with the focal length - the reduced focal length of a conventional 50mm lens when using an AIDS booster does NOT become 50 * 1.5 on crop, but is converted to approximately 50mm, thereby allowing you to work on cropped cameras with ff lenses as well as on ff, losing a little in detail (glass in AIDS boosters) and winning by about a stop in aperture