Canon Patent for EF 24-85 f/3.5-5.6 IS Lens

Egami has discovered another patent filed by Canon. The new patent describes the EF 24-85 f/3.5-5.6 IS lens which looks like to be a new kit lens for full frame Canon DSLRs.

Along with the non-L EF 24-85 f/3.5-5.6 IS lens, Canon patent also shows a EF 24-70 f/4L IS lens. Both lenses appear to be less expensive kits for full frame DSLR cameras. Canon currently has EF 24-105mm f/4 L IS USM lens in the lineup.

See details of the Canon patent for EF 24-85 f/3.5-5.6 IS lens below.

Canon Patent for EF 24-85 f/3.5-5.6 IS Lens

Canon EF 24-105mm f/4L IS USM

Canon EF 24-105mm f/4 L IS USM Lens

Description and self-interpretation of the patent literature

  • Patent Publication No. 2014-16464,2014-16465
    • Publication date 2014.1.30
    • Filing date 2012.7.9
  • Example 3
    • Macro when in parentheses
    • Zoom ratio 2.84 (2.87)
    • Focal length f = 24.30-35.10-69.00mm (67.23-60.62)
    • Fno. 4.10 (5.28-5.56)
    • Half angle ω = 41.68-31.65-17.41 ° (17.84-19.64)
    • Image height Y = 21.64mm
    • 134.65-141.04-164.94mm overall length of the lens (162.09-152.75)
    • BF 39.15-46.02-59.68mm (64.95-67.73)
    • β = -0.17 (-0.7)
  • Example 4
    • Macro when in parentheses
    • Zoom ratio 3.42 (2.84)
    • Focal length f = 24.30-35.10-82.99mm (68.22-64.03)
    • Fno. 3.58-4.42-5.89 (5.92-5.87)
    • Half angle ω = 41.68-31.65-14.61 ° (17.60-18.67)
    • Image height Y = 21.64mm
    • 126.64-128.32-155.92mm overall length of the lens (149.57-148.58)
    • BF 39.39-49.31-64.14mm (65.59-65.96)
    • β = -0.17 (-0.6)
  • Canon patents
    • (4, etc. as in Example 3) seven-group zoom of positive and negative positive and negative positive positive and negative
    • (4, etc. the second group, as in Example 3) inner focus
    • implement the macro function by the first group fed out to the object side

via EG