Yeah.. I had a 70-200 2.8L IS, my mate still has his 70-200 2.8 non IS. On the same tripod, same camera same settings, jumping from one lens to the other in varying lighting conditions (during the course of twilight through to night) neither of us could pick the difference in images. (Camera was a 5D as we didnt think that the 350D I had would be sensitive enough to detect any difference.)
I dont mean to sound argumentative, that was just the results of the tests we did... we also tested them hand held at sporting events (V8 supercars) was a cloudy overcast day so lighting wasnt favorable, again couldn't notice a difference...
Just the results I've seen using the two lenses side by side comparatively
Alex.
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