80-400VR is my main always on camera lens and has been for the past two years, we are great friends!
The reason for considering changing my old faithful is better VR operation in the 70-200. I own 24-120VR and 200-400VR and I find VR operates better in these two in steadier conditions. 200-400 really opened my eyes to this bringing back nearly 50% keep photos rather than 25% using 80-400. The second temptation is 2.8 max aperture and third focus speed from the AF-S system. Motivated by everything except image quality!
Mirror Lock Up (MLU) was not used in the test but VR kept things steady and I shot burst mode choosing the centre shots from burst for minimum shake with my hand acting as a steadying beanbag.
Thanks Leif, for the links they show the sort of information I was searching for.
I don't intend using TC20EII with 70-200 as I have 200-400 for longer reach shots but is a bit bulky and attracts attention I do not want. 200-400 is great in the right situation but not as an always on lens, 70-200VR should fit the bill occasionally used with TC17EII for a comfortable overlap.
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