Egami (translated) spotted a patent filed by Canon for an EF-S 15-85mm f/3.5-5.6 lens. This lens will replace the EF-S 15-85mm f/3.5-5.6 IS (released 2009). We got some rumors saying that this lens will come with STM on board. Egami itself suggests it could be the next kit lens for Canon’s high-end APS-C bodies.

Machine translated patent description:

• Patent Publication No. 2015-75570
  • Published 2015.4.20
  • Filing date 2013.10.8
• Example
  

  embodiment

  Example	Zoom ratio	Focal length	Fno.	Half angle	Image height	Overall length	BF
  One	4.61	18.00 27.48 83.00	4.00 4.58 5.80	37.1 26.3 9.3	13.6	133.1 140.0 160.0	37.1 41.6 50.3
  Two	4.88	17.00 26.34 83.00	3.99 4.49 5.80	38.66 27.31 9.31	13.6	127.12 133.64 154.74	35.00 39.12 48.89
  Three	5.28	15.50 22.82 81.84	3.60 4.10 5.85	41.39 30.91 9.48	13.66	128.40 134.55 169.41	35.48 43.51 66.65
  Four	5.26	15.60 22.19 82.00	3.50 3.97 5.84	41.21 31.62 9.46	13.66	128.18 134.63 171.19	36.37 43.38 67.86

  Image height Y = 21.63mm

• Canon patents
  • Positive and negative grain positive and negative positive 5-group configuration (Examples 1 and 2)
  • 4-group configuration of positive and negative grain-positive-positive (Examples 3 and 4)
  • Inner focus (the second group)