Here is a new Canon patent application. Canon patent application 2024111453 (Japan, published 8/19/2024) discusses…
Canon Patent For 55-300mm f/4-5.6 IS STM Lens With Inner Focusing
Egami (translated) spotted a patent filed by Canon for a 55-300mm lens with image stabilisation and inner focusing (lens does not extend when focusing). The patent ale refers to a EF-S 55-250mm F4-5.6 IS STM lens
- Patent Publication No. 2014-145960
- Published Date 2014.8.14
- Filing date 2013.1.30
- Example 3
- Zoom ratio 5.20
- Focal length f = 56.80-135.16-241.32mm
- Fno. 4.16-5.18-5.88
- Half angle ω = 13.52-5.77-3.24 °
- Image height Y = 13.66mm
- The overall length of the lens 153.89-191.28-208.89mm
- BF 38.57-57.95-65.38mm
- Example 5
- Zoom ratio 5.20
- Focal length f = 56.37-133.75-293.01mm
- Fno. 4.16-5.18-5.88
- Half angle ω = 13.62-5.83-2.67 °
- Image height Y = 13.66mm
- The overall length of the lens 155.00-190.52-210.00mm
- BF 38.40-54.49-65.40mm
- Canon patents
- Inner focus
- Vibration control