Originally filed back in December of 2013, Patent Publication No. 2015–111192 (translated) shows a 20mm lens made up of six elements in five groups. Focusing for the lens is done through #Canon’s Stepping Motor Technology (STM), enabling smooth focus transitions when shooting in video mode, which all Canon APS-C DSLRs are now capable of.
As pointed out by Canon Rumors, this lens is very similar in focal length to Canon’s current 24mm f/2.8 STM, which packs quite the punch in a small form factor. Thus, it could be nothing more than a left over patent from the 24mm’s design.
Imaging Resource © 1998 -2015 . Material on this site may not be reproduced, distributed, transmitted or otherwise used without the prior written consent of