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Old Feb 20, 2005, 7:13 PM   #1
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In my experience the EF-S 17-85is "sharper"and hasbetter contrastwith comparable( if not better in the case of the 28-70L) color reproductionthanCanons 28-70 L and24-70 L. The 17-40 L being closest in terms of image quality.

I went through a very expensive lens purchase and testing process to arrive at this conclusion. Needless to say I was surprised and somewhat irritatedby these results.

It's been a revelation to say the least. This lens has earned my respect big time. I can only laugh when I read post's sayingit's overpriced "for what it is". My friends it's a bargain. Only later did I read about MTF ratings that comfirmed technically what I have seen in real world applications. I bought and compared the 28-70 L and 24-70 L and "WANTED THEM TO BE BETTER". They were not!!

I have a 70-200 f4 L and it's a great lens. The 17-40 L is also a great lens, but the EF-S 17-85 isthe keeper with the added benefit of extended focal lenght and IS.

If there was any objectivity about lens performance the EF-S 17-85 would have an "L" designation. End of story!

tonyM


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Old Feb 20, 2005, 11:37 PM   #2
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If this is all true, you are my new friend Tony.
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Old Feb 21, 2005, 8:03 AM   #3
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Ponin wrote:
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If this is all true, you are my new friend Tony.
I believe Peripatetic made a case for this analysis: http://www.stevesforums.com/forums/v...62&forum_id=65

As to the 24-70L: http://www.pbase.com/fstopjojo/sigma_2470
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Old Feb 21, 2005, 7:25 PM   #4
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I like what I here here, I think I'm going to call b+h photo now:-) But what should I do with my ef-s 18-55
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Old Feb 21, 2005, 8:22 PM   #5
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Keep it. Use it in situations where you'd rather not take or use your more expensive glass. If you sell it you'll probably not net more than $75-$80US, especially if you sell it on eBay and pay the high fees.
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Old Apr 18, 2005, 6:14 PM   #6
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Interesting data.

Did you compare the 24-70L at F4 and F5.6 against the 17-85 at F4 and F5.6? The 24-70L is a constant F2.8, thus that means the 24-70L gets stopped down one or two stops. Is the 17-85 still sharper (wide open) it if you compare at the same apertures against the 24-70L?

Thanks,
Barthold
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Old Apr 18, 2005, 6:51 PM   #7
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barthold

The blue Canon's MTF is @ f/8 for the 24-70mm -> even when the 24-70mm is stopped down to this aperture the 17-85mm IS USM is clearly ahead wide open (basically the 17-85 is as sharp @ f/5.6 as at f/8 according to the left curve):

vs

... if one goes outside the 13mm image circle then the 24-70 may be superior
-> but remember the 24-70 has a much better 'bokeh' wide opened which is not measured by the MTFs
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Old Apr 18, 2005, 10:03 PM   #8
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Is there a tutorial around to learn how to read these charts? :?:

Or just say what the y and x axis represent that would help, too...

:-)
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Old Apr 18, 2005, 10:52 PM   #9
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BoYFrMSpC wrote:
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Is there a tutorial around to learn how to read these charts? :?:
From the Canon site - How To Read MTF chart ?
... and to be complete from the Sigma site as well :-)
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Old Apr 18, 2005, 11:11 PM   #10
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I don't know about the charts. I just get demonstrably sharper pictures with the 17-85 than with the 24-70L

crazy but true!

tony
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