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A patent for an EF 24-85 f/3.5-5.6 IS has appeared. Along with this lens is a patent for the EF 24-70 f/4L IS. I do think Canon does need a new full frame non-L zoom lens to go into less expensive kits, or for an even less expensive full frame camera down the road.
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
Source: [EG]
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