EF-S 17-55 Replacement Coming?
A patent has been discovered showing the existence of an EF-S 17-55 f/2 IS lens.
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 Comments
If it’s true, they better have a tc to go with it.
There is absolutely nothing that would excite me regarding this lens. Zip! If it’s the aspect of 2.0 buy a prime. If it’s the aspect of Extra-wide to 55 there’s noting to gain except distortion. L’s or nothing.
Huh? 17mm on 1.6x FOVCF is a mere ~27mm on FF35, it’s not really UWA. It’s the aspect of a zoom lens that lets in twice the amount of light than all other “pro-quality” zooms combined with IS that makes this a compelling lens for crop cams. It’s EF-S for the simple reason that it’s more practical to make it that way.
correct!
period
Cause Canon doesn’t want to sound like Nikon… For example: Nikon AF-S 70-200 F2.8 G IF-AD
What kind BS description for a lens is that?
HEHEHE