Canon Patents 30mm F/2.8 DO for Full Frame Mirrorless
Canon has lodged a patent for a 30mm f/2.8 DO lens, supposedly intended for full frame mirrorless cameras. Yesterday we brought you information on what may be the first sighting of Canons full frame mirrorless camera, so it is interesting to see patent literature which seems to show that the manufacturer is indeed headed in that direction. This patent also marks the first time that we have seen Canon employ diffractive optics in a lens intended for a mirrorless camera. The use of the technology, which allows for lighter weight, more compact than standard lenses to be produced makes sense when used with mirrorless system cameras, the ethos of which is to offer shooters DSLR flexibility in a smaller more portable package. Interestingly DO technology has not been seen in a short focal length Canon prime before, a 30mm lens would not be large in the first place, so we are intrigued to see just how much smaller use of DO optics can make it. Check out the translated patent information below:
- Patent Publication No. 2016-102851
- Published 2016.6.2
- Filing date 2014.11.27
- Zoom ratio 1.00
- Focal length 31.35
- F-number 2.86
- Angle of view 34.61
- Image height 21.64
- Overall length of the lens 85.29
- BF 29.99
- Canon patent
- Positive ShiboTadashi
- Diffractive optical element (the second group of aperture stop image side)
- Correct axial chromatic aberration and lateral chromatic aberration of the near-infrared light
- The present invention relates to a magnification chromatic aberration correction of the imaging optical system used in a near infrared region from the visible region is suitable especially monitoring optical system.
This patent is also not the only DO patent Canon has had published recently, we have also seen patents for an APS-C 50-300mm and an EF 1000mm, and the manufacturer already makes the EF 400mm f/4 DO IS II USM and EF 70-300mm f/4.5-5.6 DO IS USM Lenses.
Canon is really pushing diffractive optical technology right now, more so than any other lens manufacturer and it will be interesting to see what other DO lenses they have planned for the future.