I just got my new 100-400 and had a go with my 1DX. I have the latest 70-300, 70-200, 300 and 500 primes. I have never needed to adjust any of the len's, they were all perfect right out the box. I just get on shooting and look at the images I get which are all bang on sharp. What I can say is the new 100-400 focus's fast, feels great to handle and the level of sharpness just blew me away. I get really nice contrast and colours its just one amazing lens and a real worthy upgrade to the old one. Ok its not quite the 300 prime but that's just the best lens i've ever used and over three times the cost but I tell you its not that far off in real world shooting and a real good match when using the extender on the prime. Its also lighter and easier to use as I get older. Possibly...no it is the best "all round" does everything lens ive ever used. Ill give it a go on the new 7D tomorrow and expect equally good results. It may be a few £'s more than some competitors but like many things in life...you get what you pay for. Now...how do I tell my wife ive been shopping again..........
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