I just bought a Tamron 150-600 and for the pure sake of getting mad with mms I wanted to try it with a TC. I already own a Kenko pro 300 DGX 1.4, and I had seen on the web already somebody using this lens with this TC, but to my great disappointment I get "Err 01" message on my 5d Mark III when I try this combination.
It seems to only work in LV mode... which might be enough for some experiments anyway (usual boring stuff like the moon or whatever I feel like to try playing with many mms).
I'm quite sure I had seen somebody using the 3 things together before, so what can it be? any camera settings that might affect this? Any little trick to make it work? Unlucky "version" of one of the 3?
On the other hand... it works on my old 50D (without AF of course)... making it possible to shoot at an equivalent focal of 1344.. wow!
Greetings from Italy and... grazie!