Canon has published a patent for two new zoom lens in the 28-70mm f/2.8 and 28-60mm f/2.8 focal length ranges. What makes them particularly interesting, though, is how tiny they are, for zooms with such wide aperture zooms, with both coming in at a little over 105mm long at the shorter end of their focal length limit of ~28mm. Even at their maximum zooms of 60mm and 67.9mm, they still only hit 132.38mm and 138.40mm respectively, making them very compact indeed.
The “Problem to be solved”, according to the Asobinet’s quote from the patent is “to provide a zoom lens having a short total length and a small size but having high optical performance”. And it suggests that thanks to recent development in cameras – namely, Canon’s gone mirrorless – it’s now possible to create a zoom lens of this focal length range and wide aperture that meets these parameters.