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Not sure what that was the case, but the 70-200 is a little more distracting. The first thing observed was the background blur was actually smoother on the 100-400. Here we start to see some more noticeable differences. This time we took off the extender off the 70-200. The next comparison that we did was to see how the 100mm range of both lenses compared. The bad news is that AF speed is reduced by 25% as I understand, and the biggest drawback to this combination is that the 70-200 with 2X extender is going to be twice the price. I really don't see much difference between the two at all, which means the great news is you can have a great 70-200 with the speed of the F/2.8 aperture and IS and switch to a 140-400mm F/5.6 lens by putting on the 2X Extender. There is some difference, in fact the 70-200 with the extender might be arguably so slightly better. These crops show just how little difference there is between the two lenses. Now granted the the Canon EF 70-200 F/2.8L IS USM II is a fantastic lens, it certainly shows that the image quality loss is pretty minimal. The new mark III extender is very sharp and manages to keep issues found in the older versions of the Extender down to a minimum. Both lenses showed very little difference if at all. The fact that all the controls are in one hand is something to be said about the simplicity of design. I'm used to using both hands to change settings or press buttons on my 5Dmk2 and the 7D with the left hand, but frankly, this camera just in one hand is very well suited for quick setting and shooting without the need of the spare hand. I found it relatively intuitive and pretty quick to use.
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I was impressed with build quality and although it took me a few minutes to get used to the interface. I must say, that choosing to use this camera to do this test wasn't disappointing. I was shooting in some pretty cold weather today, but the mount still has a tight fit and with a big lens is pretty important. It might be more the fact that this is a newer camera than all my others, but the mount is very positive and tight. Some more thoughts on the new Canon EOS Rebel T3i.