Here is a new Canon patent application for two zoom lenses. Canon patent application 2024160458…
Canon Patent for EF-EF-M Adapter with Improved Auto-Focus Speed
Egami (translated) spotted what could be Canon’s best move to push their mirrorless cameras. A new EF-EF-M adapter that should deliver better AF speed when using EF and EF-S lenses. While the AF performance of Canon’s new EOS M3 is excellent with the native EF-M lenses, AF performance is limited when using EF lenses via the currently available adapter. If Canon puts such an adapter on the market it would a huge selling point for the EOS M3. Access to Canon’s extended lens lune-up, and same AF performance as with native lenses!
Machine translated patent description:
- Patent Publication No. 2015-34903
- Published 2015.2.19
- Filing date 2013.8.9
- Master lens
- Zoom ratio 2.69
- Focal length 72.13 135.02 193.99mm
- Fno. 2.90
- Half angle ω = 10.72 5.78 4.03 °
- Image height Y = 13.66mm
- Overall length of the lens 237.36mm
- BF 54.00mm
- Adapter installed
- Zoom ratio 2.69
- The focal length f = 72.12 135.00 193.96mm
- Fno. 2.90
- Half angle ω = 10.72 5.78 4.03 °
- Image height Y = 13.66mm
- Overall length of the lens 239.70mm
- BF 16.77mm
- Canon patent
- Fast AF adapter
- Wobbling corresponding
- 3-group configuration of positive and negative positive
- 2 group also serves as a focus group and the anti-vibration group
- And realize high-speed AF focus group was lighter