I have to admit that with the 600/11 at 300 yards the swans are soft due to unstable air.
On cropping the 100 mm I do that now with the 100-400Lii. I have a 2xiii extender but it is definitely softer than or 1.4 on any lens and the 1.4 introduces some softeness as well.
I can use the 200-800 or 30 days as long as I am careful with it.
Starting to wonder it is the be all and end all to distance or whether to add a 800/11 (used) to the stable instead) the only thing about the 800 is that it is hard to get BIF in the FOV, the 600 is much better but still can be tough.
agonizing wondering and thinking...
DO I stay with what I have or get the lens. I do find that the 150-600C tends to be a lot of weight and the new one is heavier 4.5lbs to 4.3lbs but about the same.
the more I think the less sure I am....


. And it just a tad sharper than my EF100-400II IMO except that is an RF lens. Pre-ordered 10pm PST Nov 1, hopefully it will be here by December
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