Speed Booster for Canon EOS-M spotted. And new Lens Turbo already for sale!


CanonWatch spotted that video showing a yet not announced Speed Booster adapter for the Canon EOS-M system! On Metabones website you can find NEX and X mount adapters only.

And by the way, Metabones isn’t the only manufacturer offering a “Speed Booster” solution. The Chinese company Mitakon now sold their first “Lens Turbo” adapters on .

  • tecnoworld

    I’d like to see a review of the cheaper chinese ones. Do they degrade or soften image in any way? Is the increase in lens speed for real? (e.g. a f2 full frame lens will really behave like f2 on APS-C, instead of behaving like f2.8?)

    • Safeen

      f2 full frame lens with speed booster will behave like f1.4 on APS-C

      • tecnoworld

        I’m probably missing something. Correct me if I’m wrong. At f2, the physical aperture on a 50mm lens is 25mm (50/25=2). But the lens on APS-C acts as if it were a 75mm, with always the same physical aperture, so shouldn’t its “f number” be equivalent to 75/25, i.e. about 3, on APS-C?

  • Camaman

    And Mitakon also doesn’t offer FD mount!
    Hellooooou! It’s the most versatile one!

    But I guess they would rather you buy more than one I guess. ;-/

  • Safeen

    that is not how you calculate the f number of the lens. anyway think it of this way, since the focal lengths of the 50mm with the speed booster will be like 35mm on the APSC, that means your 50mm will behave like 35 on the APSC which roughly equivalent to 50m on the full frame. now we know the image projectile of every full frame lens is designed to cover a a circle with a diameter of roughly about 44mm which is way more than it requires to cover an APS-C sensor. so what the speed booster does is narrows the diameter of the image circle to something just about to cover an APS-C sensor but it doesn’t not reduce the amount of light coming through the lens. and this lead to intensify the light in a smaller image circle hence you get a faster shutter of about f1.4 on the APS-c sensor just like magnifying glass you can reduce the diameter of the intensity of the light by moving your magnifying glass to a desirable position. i hope this explained it not in a technical way.

  • tecnoworld

    Thanks, really interesting. So, basically, a ff lens on aps-c with speedbooster will be more luminous than on a ff?

By continuing to use the site, you agree to the use of cookies. more information

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.

What are Cookies?
A cookie is a small file of letters and numbers that is stored in a temporary location on your computer to allow our website to distinguish you from other users of the website. If you don't want to accept cookies, you'll still be able to browse the site and use it for research purposes. Most web browsers have cookies enabled, but at the bottom of this page you can see how to disable cookies. Please note that cookies can't harm your computer. We don't store personally identifiable information in the cookies, but we do use encrypted information gathered from them to help provide you with a good experience when you browse our website and also allow us to improve our site. You can watch a simple video from Google to find more information about cookies.

Cookies used by our Website
The Mirrorlessrumors website, Mirrorlessrumors.com, uses the following cookies for the collection of website usage statistics and to ensure that we can . These are anonymous and temporary. By using our website, you agree that we may place these types of cookies on your device.
Read how Google uses data when you use our partners' sites or apps: http://www.google.com/intl/en/policies/privacy/partners/
Google Analytics Cookie Usage on Websites: https://developers.google.com/analytics/devguides/collection/analyticsjs/cookie-usage?csw=1#cookiesSet Addthis cookies: http://www.addthis.com/privacy.
Disqus cookies: https://help.disqus.com/customer/portal/articles/466235-use-of-cookies.
Vimeo cookies: http://vimeo.com/privacy.
Youtube cookies: https://support.google.com/youtube/answer/171780?hl=en-GB

Disabling/Enabling Cookies
You have the ability to accept or decline cookies by modifying the settings in your browser. Please note however that by deleting our cookies or disabling future cookies you may not be able to access certain areas or features of our site. For information about how to disable cookies in your browser please visit the About Cookies website.