I use mine on the 5D-III and I'd say it is good even wide open from 150-500mm at 600mm I feel the need to close down to f/9 or f/10 to get nice sharp results. So it does have some advantage over the new EF 100-400mm at the very least from 400-500mm.AlanF said:RickWagoner said:It will take some time to get used to the Tamron and learn its way, unlike oem lenses like canon brand lenses every third party lenses has some goofy quirks about them on different bodies. For example lots of 7d2 owners need to micro adjust the tammy but on the 70D the servo tracking is a bit slow, i am not sure what the quirk s on the 5d3 body. Join the tamron 150-600 fb group and they will help you get setup and going fast with the lens.
The good news is the Tammy loves full frame bodies and works well on the 5D3 compared to crop stuff.
Anything at 150-400 can be shot beautifully wide open with fast autofocus and tracking, you may find your old 100-400 not getting much use anymore because the Tammy is that good. After 400 and to 600mm it will get soft wide open but if you step to f8 it is easily a great optic. The Tammy like every lens likes to be closer to the subject than further away and you will see a big difference it plays but if you shoot a bird for example super far out then don't go to 600mm, take the lens back to 400mm and shoot the bird so it will be a sharper crop later on. Scaling back to 400mm wide open also is the way to shoot bif with it and turning on the focus limiter helps your autofocus speed amazingly. Give it a good few months of shooting before you judge the lens, once you get it down you will love it no question. No need to play with extenders or anything with it, just walk and shoot.
It seems that you saying that the Tammy 150-600mm is best used between 150-400mm for all purposes - from BIF to birds far away? If so, wouldn't the 100-400mm be preferable?
Note: this advantage only applies to full frame shooting. If you shoot on a modern APS-C body and close down your aperture (e.g. f/9 - f/10) then this would soften your images due to diffraction.
Here is a nice roundup of the lenses on the market:
https://www.youtube.com/watch?v=TawKGClbECU
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