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CheshireCat: I am not completely happy with the AF and IQ of my 400 DO II when used with a x2.0 III extender. I checked the micro focus and found it right on, so that is not a problem. I should add that this lens is tack sharp wide open with a x1.4 III extender and focuses very fast on both a 1DX and 7D2.
I have compared the 400 DO II on a 7D2 and a x1.4 III extender with the 400 DO II on a 1DX and a x2.0 III extender. The IQ was better on the 7D2. Based on Canon's predicted performance with a x2.0 III extender, I find this a little surprising. I think the x2.0 III extender is going to be something that one uses when the image can not be gotten any other way - not something to use continuously.
The reason for going with the 400 DO II was to lighten the load when in the field and to make hand holding less stressful to the shoulder I had replaced a few years ago. The new 500/4 would certainly be lighter, but the size is still there. I can't get over how small the 400 DO II is.
For comparison, my previous birding setup consisted of a 1DX, a 500/4 (previous version), a x1.4 extender, and a Gitzo tripod with a Jobu gimbal head - focal length 700mm, weight 20.5 lbs. The new 400 DO II mounted on a 7D2 (easily hand holdable) - focal length 640mm, weight 7.5 lbs. Image quality - equal below ISO 1600. My thinking is that the 400 DO II is going to be a very good match with the 7D2.
Even considering my few complaints, the more I use this lens, the more I like it. For me it is a keeper.
Edited on Feb 08, 2015 at 07:41 PM · View previous versions
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