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Old Aug 31, 2005, 1:49 PM   #1
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Could someone poste some test shots of the Canon 70-200 with the 2xTC?
I did a few tests with the Sigma EX DG and I am a bit dissapointed:
http://limbik.smugmug.com/gallery/765894
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Old Aug 31, 2005, 1:53 PM   #2
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I believe a member here: fstopjojo, did that already:
http://www.pbase.com/fstopjojo/image/43917016

Also FYI: http://www.photosig.com/go/photos/br...ories?typeId=7
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Old Aug 31, 2005, 9:43 PM   #3
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fstopjojo does not seem to have any with the 2xTC. I looked at his test before I bought the 70-200. Thanks for the photosig link, I was checking out the pics with the TC, but it looks like many of them have had some photoshop retouching, so its hard to do a comparison. If anybody has this combo, please post some quick examples if you get a chance. Thanks.
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Old Aug 31, 2005, 10:08 PM   #4
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The bottom left corner of the above link (or below) has a test picture of the 70-200 IS USM with the 2x TC:
http://www.pbase.com/fstopjojo/image/43917016

Also see here: http://www.pbase.com/fstopjojo/image/42828610/original

I've posted this observation before: the Sigma may show some CA (blue fringe) when combined with this TC (Tamron), but look at the Canon picture right above the lower right corner on the horizontal fence (where the white flower is), the 'L' shows quite a fair amount of horizontal red fringe which is absent on the Sigma -> this has the tendency to increase the contrast when the picture is viewed as normal (i.e. un-magnified) very similar to the effect of USM...

BTW the EF 24-70 L in fstopjojo tests also show theses horizontal red fringes
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Old Aug 31, 2005, 11:52 PM   #5
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NHL wrote:
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the 'L' shows quite a fair amount of horizontal red fringe which is absent on the Sigma -> this has the tendency to increase the contrast when the picture is viewed as normal (i.e. un-magnified) very similar to the effect of USM...

BTW the EF 24-70 L in fstopjojo tests also show theses horizontal red fringes
Very interesting... Although I don't exactly understand how those were shot at f2.8?? Wouldn't the lowest you could get be 5.6 with the 2x?
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