× Search
Canon Patent Application: Metabones speedbooster on an EF-M camera
/ Categories: Canon Patents
This post may contain affiliate links(s). An affiliate link means I may earn advertising/referral fees if you make a purchase through my link, without any additional cost to you. It helps to keep this site afloat. Thank you in advance for your support. If you like what we do here, maybe buy me a coffee.

Canon Patent Application: Metabones speedbooster on an EF-M camera

This patent application makes a special notation that this patent isn't about the teleconverter, however, about aspects of the light falloff from the teleconvertor and peripheral illumination compensation when using an adapter.  The referring US patent is from Caldwell Photographic, the original inventor of the Metabones speedbooster .

The embodiments show a 132mm 2.0 EF lens (full frame with a large back focus), with a converter in place turning into a 105mm, 1.66 lens (APS-C with a  small 18mm backfocus).

Is Canon looking to make their own branded speed booster or simply doing a patent for using a metabones speedbooster on a Canon camera.  To date, no Canon camera uses a metabones speedbooster and I know our queries to Metabones has returned no information about a possible EF-M speedbooster.  The EF-M mount finally has it's own speedbooster done by Viltrox, however, it would be fantastic to have metabones supply an adapter as well to the growing EF-M mount population.

I'll be curious to hear the thoughts of others in the comments below.

As with all our patent finds, some of these may never reach the end of the day in an actual product, but it shows us areas of Canon research.

Japan Patent Application 2018185393

Previous Article Canon Patent Application: Canon 35mm 1.4
Next Article Canon Patent Application: APS-C Zoom lens for Powershots
blog comments powered by Disqus

Keep In Touch


How to view Japan Patent applications.

Unfortunately, there's no direct way of linking to the patent application (sad!) however, this is the easiest process to view a japan patent or application.

  1. Go to the Japan Patent Office search page.
  2. If it's a patent application (they are usually in the format of Year-Number ie: 2017-011300) then type the patent application number into the second field down from the top where it says publication of patent application. 
  3. Click on search.
  4. Then click on the patent application number link, and there's the patent application!

Our Preferred Sponsors

Want to buy me a coffee?

Free Shipping to the USA and Canada*

Use CANONNEWS for $10 off AuroraHDR

Use CANONNEWS for $10 off Luminar

*Conditions may apply


Terms Of UsePrivacy Statement© 2023 by CanonNews. This site is not affiliated with Canon Inc. or it's subsidiaries.
Back To Top