Interesting discussion. I only use Canon AF IS lenses and have very satisfactory results. The lenses that I use most commonly are: 28-135 IS and the 100-400 AF IS zooms. I use the IS all the time and am able to take great shots at slow speeds handheld. I use a 500 AF IS for birds. This is also a wonderful lens but if I use the 100-400 with a 1.4 I really cannot tell the difference.
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