Egami spotted another patent filed by Canon. The new patent describes the EF-S 17-55 f/3.5-5.6 IS STM lens which looks like to be a new kit lens for APS-C sensor Canon DSLRs.
Canon EF-S 17-55 f/3.5-5.6 IS STM lens could be announced this year as a replacement for the current EF-S 18-55mm f/3.5-5.6 IS STM lens. The new 17-55 kit lens could also be waiting to be announced from last year. Also there is an example for the 18-55mm kit version.
Below are the patent details translated by machine.
Canon Patent for EF-S 17-55 f/3.5-5.6 IS STM Lens
Description and self-interpretation of the patent literature
- Patent Publication No. 2014-21258
- Publication date 2014.2.3
- Filing date 2012.7.18
- Example 2
- Zoom ratio 2.92
- Focal length f = 18.50-32.89-54.00mm
- Fno. 3.49-4.39-5.80
- Half angle ω = 36.44-22.55-14.20 °
- Image height Y = 13.66mm
- 119.77-110.06-120.23mm overall length of the lens
- BF 37.98-52.51-74.3mm
- Example 3
- Zoom ratio 3.09
- Focal length f = 17.50-32.05-54.00mm
- Fno. 3.47-4.38-5.80
- Half angle ω = 37.97-23.08-14.20 °
- Image height Y = 13.66mm
- 119.55-108.81-118.68mm overall length of the lens
- BF 36.59-51.53-73.93mm
- Canon patents
- 4-group zoom of positive and negative positive negative
- Inner folder – Kas (Group 3)
- The fourth lens unit can also be used for anti-vibration
via EG
