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A patent showing an optical formula for a Canon EF-S 9-20mm F4.5-5.6 IS has appeared. I would assume this was part of the development for the EF-S 10-18mm f/4.5-5.6 IS and that there isn't another wide angle zoom coming for APS-C.
Patent Publication No. 2015-31869 (Google Translated):
- Published 2015.2.16
- Filing date 2013.8.5
- Zoom ratio 2.07
- Focal length 9.50 14.52 19.70
- F-number 4.64 5.21 5.80
- Half angle (in degrees) 55.17 43.26 34.74
- Image height 13.66
- Overall length of the lens 143.95 134.71 134.11
- BF 38.00 47.58 56.42
Canon EF-S 10-18 f/4.5-5.6 IS STM $299: Amazon | B&H Photo | Adorama
