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Old Oct 9, 2006, 11:01 PM   #1
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Almost a year ago I decided to shoot some moon shots after someone asked about it on this forum. At the time I had a Canon 75 - 300 IS lens and a 20D. I shot it hand held. I recently upgraded to a 5D and replaced the lens with the Sigma 100 - 300 F4. I took the same shot hand held. In the photo (merged) one is with only the 75 - 300 and the other is with the 100 - 300 with the 1.4 tele-converter attached. I'll let NHL tell you which is which.
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Old Oct 10, 2006, 11:33 AM   #2
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With the crop factor and handheld - left is most likely Sigma?
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Old Oct 10, 2006, 4:48 PM   #3
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I say right is the Sigma. I took the same moon shot experimenting with the Canon 1.4x and 2x TC and the 100-400IS, I'd expect the Sigma 100-300 to be as good.
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Old Oct 10, 2006, 5:45 PM   #4
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The Sigma is on the right. When the photos aren't enlarged they both look reasonably sharp but the 100 - 300 is in a class of it's own when it comes to sharpness. NHL since you were the one who encouraged me to go with the Sigma, I thought for sure you'd get it right (pun intended)
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Old Oct 10, 2006, 9:49 PM   #5
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I try to reason this one out... and got it wrong :sad:

-> The 20D is 1.6x and since the 5D is a full-frame and you add the 1.4x TC I went with the smaller picture (left), the next tricky one is 'handheld' and the ISO wasn't specified so I gave IS credit for the sharper picture...
Oh well - A body with built-in IS would be a perfect match for this Sigma and IMO you're not giving up much by not getting the f/2.8 version (to save both $ and weight)
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Old Oct 10, 2006, 10:12 PM   #6
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To be fair, the 5D has higher resolution (bigger image) so that and the 1.4 multiplier makes the image size very close. I'm surprised that I'm get consistently sharper photos using this lens (Sigma) compared to my old 75 - 300 IS lens when taking hand held photos. When I first picked it up I was so dismayed at what I thought was a lot of weight and size, that I posted a thread about it. Somehow the extra weight seems to steady me. It does get heavy when you're walking around all day with it. My heart was set on the Canon 100 - 400L IS lens. I really glad I asked before buying, one I really needed the extra money I saved and the addition of the 1.4 multipliergives mesimilar magnification as a 400 mm zoom lens with the same sharpness. When only up to 300 mm is needed, it's a bit brighter too.
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Old Oct 11, 2006, 6:02 AM   #7
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Actually on a 1D MrkII the 100-400L 'feels' bottom heavy because the larger body has so much more mass, but according to photozone I was surprised to see the 100-300 f/4 EX (even @ 420mm with the 1.4x), out resolved the 100-400L in almost every measurements, including vignetting and CA:
http://www.photozone.de/8Reviews/len...00_4/index.htm
http://www.photozone.de/8Reviews/len...6_is/index.htm

This lens also comes within hairs of Canon's own 300L f/4 prime, and even outscores it wide open @ f/4 which is quite an accomplishment for a zoom
http://www.photozone.de/8Reviews/len..._4is/index.htm
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