The 400mm f5.6 is sweet b/c of the weight. Not only is it relatively easy to handhold in decent light, but you don't have to dump $2000 into a tripod setup to support the lens. B/c of the light weight, I've had what I would consider critically sharp images with the 400mm f5.6 at 1/200s on a monopod. However, this is with me holding down the shutter and picking the one sharp one out of 15 from a 6fps burst. I wouldn't expect to use a single frame to capture a keeper with the 400mm f5.6 on a monopod at 1/200s. Anything under that and you pretty much just have to get lucky unless your technique is far superior than mine!
Now, I have a question: has anybody used the 400mm f5.6 with a 1.4x III. The posted iso charts look pretty good. The third generation teleconverter definitely gives you some better sharpness at the periphery. I've been throwing around the idea of getting a used 1d mark III (especially b/c you can pick these up for almost the price of a new 7d) for awhile and I was wondering if anybody uses this combination and how much AF speed is lost? Sorry if I change the direction of the thread, but I thought it was somewhat pertinent.





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