Got my new generation 2.0x TC yesterday and decided to test it out on my recently acquired 300mmf 2.8 L IS immediately at the local duck pond. Light wasn't what I had hoped for but I got enough sample images to more than satisfy me and justify the purchase.
This sacred ibis was flying low and coming by quite quickly. The AF locked on to it early and kept tracking the bird until I lost it in the viewfinder. The AF is certainly much quicker than my "old faithful" 100-400mm that I have used for most of my birding shots.
Sharpness wide open seems to be hair-splitting close to being ON PAR with my results using the 1.4x TC-mk2 wide open, and my opinion is that you will have to start pixel-peeping to see the difference between with either 1.4x or the bare 300mm if you stop down a tad to f7.1.
I am happy to have a viable 600mm f5.6 combo that didn't cost me my children's future education funds
Your comments and thoughts much appreciated...
Techs:
Canon 7D with 300mm f2.8 L IS USM + 2x TC-III (600mm)
f5.6 @ 1/2500 SS @ ISO-1600
Exposure bias +1
Cropped out about 40% of the image from the top, right and left









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I really like and appreciate your photography, so I thought I mention this, hope you don't take it personally

