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Old Nov 26, 2006, 11:47 PM   #1
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I have received great results for general landscape (mostly sunrise/sunsets), youth soccer, and some close portrait work with a Canon EF-S 17-85mm f/4-5.6 IS on my Canon 30D.



After reading a significant amount of positive feedback about the 70-200mm f/2.8L IS, I couldn't wait to get my hands on one to give it a try. I received my copy last Wednesday from B&H and have been shooting and evaluating a great deal since.



While the Bokeh and speed of the 70-200mm is everything that I have read about and more (and the overall quality not bad), I guess I expected significantly sharper images from the L series lens than from the EF-S lens. My comparisons have both lenses pretty much a draw as to quality.



I just wanted to get some feedback to confirm that the 70-200mm I received is a good copy and that I might just have an excellent copy of the 17-85mm as well.



I can provide sample shots if interested and thanks for the help.


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Old Nov 27, 2006, 10:51 AM   #2
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Can you post some shots from 70-200 f2.8 IS?
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Old Nov 27, 2006, 8:06 PM   #3
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mr-video wrote:
Quote:
While the Bokeh and speed of the 70-200mm is everything that I have read about and more (and the overall quality not bad), I guess I expected significantly sharper images from the L series lens than from the EF-S lens. My comparisons have both lenses pretty much a draw as to quality.
The measured MTF's pretty much confirmed your findings:
http://www.photozone.de/8Reviews/len...28is/index.htm
http://www.photozone.de/8Reviews/len...6_is/index.htm

The noticeably sharper lens is the non-IS version:
http://www.photozone.de/8Reviews/len...0_28/index.htm
-> especially at the peripherals where the non-IS 70-200 f/2.8L excels over the other two :idea:
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Old Nov 27, 2006, 10:10 PM   #4
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Thanks NHL for the info. I'm pretty new to the digital stuff and feel pretty naive.

Here is an image I shot with the 70-200L IS. (more to follow)
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Old Nov 27, 2006, 10:11 PM   #5
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And another:
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Old Nov 27, 2006, 10:25 PM   #6
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And another.
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Old Nov 28, 2006, 9:43 AM   #7
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Actually it's quite difficult for judging sharpness of the lens from the posted images:
The 2nd one is quite nice with the bokeh , but as to the 1st one and last the important areas are overexposed to the point where all details are lost



mr-video wrote:
Quote:
Thanks NHL for the info. I'm pretty new to the digital stuff and feel pretty naive.
The Photozone links provides most of the measurements one needs to know about lenses: Distortion, Vignetting, MTF (resolution) and Chromatic Aberrations(CA) in similar test conditions unlike posted pictures which is situational and depend very much on the ability of each individual photographer
For example for sharpness which is associated with the MTFs, the 70-200L IS is quite similar in number to the EF-S 17-85:

70-200L IS f/2.8 f/4 f/5.6 (@ 70mm)
Center 1684 1935 1960
Border 1506 1498 1648

75-85 IS f/5.6 f/8 f/11 (@ 85mm)
Center 1747 1920 1808
Border 1494 1515 1635

The 70-200L f/2.8 non-IS is sharper especially @ the borders!
70-200L f/2.8 f/4 f/5.6 (@ 70mm) non-IS
Center 1810 1913 1841
Border 1829 1916 1848
-> This difference is significantly greater at the longer focal range where the lens is most useful @, especially with the 2x teleconverter (their MTF results are also posted)
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Old Nov 28, 2006, 9:32 PM   #8
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This is good information. Thanks NHL for providing the link. Based on the data and your input, I am going to do several tests just to confirm my suspicions that the 70-200 copy I have is a good one and that I have a lot of work to do on my abilities.

Thanks again for the info.
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Old Nov 29, 2006, 8:20 AM   #9
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Theses other MTF measurement @ 200mm should give some food for thought if you're mainly after sharpness:
70-200L IS f/2.8 f/4 f/5.6 (@ 200mm)
Center 15991759 1795
Border 1551 1681 1742

70-200L f/2.8 f/4 f/5.6(@ 200mm) non-IS
Center 1749 1937 1938
Border 1756 1877 1924


-> IS does come @ a cost !
(i.e. with a 1.4x teleconverter on the non-IS still outresolves the IS version without for the most part)
70-200L f/4 f/5.6 f/8 (@ 280mm) non-IS with 1.4x teleconverter
Center 1728 1888 1672
Border 1652 1699 1555
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