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Canon EF-S 17-55 f/2 IS – Patent

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EF-S 17-55 Replacement Coming?
A patent has been discovered showing the existence of an EF-S 17-55 f/2 IS lens.

20100208 optical - Canon EF-S 17-55 f/2 IS - Patent
Canon EF-S 17-55 f/2 IS

Canon EF-S 17-55 f/2 IS
Patent Publication No. 2010-14866
Published 2010/01/21
Filing Date: 2008/07/02

Example 1
Focal length f = 17.50 ~ 53.05mm
Brightness F = 2.0
Focus back 34.90 ~ 48.26mm

Example 2
Focal length f = 17.50 ~ 52.36mm
Brightness F = 1.8
Back Focus 34.15 ~ 45.06mm

General
Zoom is easy to increase the rate
Increase the amount of movement of the lens
But more aberration
Large diameter is easily
To compensate by increasing the number of lens aberration
But heavier
Patent literature
Placement of the lens to optimize the refractive index
Aspheric lenses

From Here: http://egami.blog.so-net.ne.jp/2010-02-08#more

CR’s Take
I’ve looked quickly, but I haven’t been able to find the actual patent anywhere. Can anyone else?

Thanks Justin

74 responses to “Canon EF-S 17-55 f/2 IS – Patent”

  1. Oh yeah, since the current 1-kilogram 24-70 w/o IS is still too light for daily use. 24mm on a crop cam would be ~38.4mm, not really that much of a wide angle. EF-S lenses are there for a purpose.

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