So I had a chance to test out the Canon TCIII with the 600II. I was surprised in that the AF was able to grab kites against varied BGs. Of course handholding at 1200mm is not a trivial task but with the right technique the rig can deliver results that I did not think was possible at such focal length. Here is a frame
1D4 1200mm (600II + TC 2X III) f/8 1/2500sec ISO 1250. HD size here
you can read my findings on my blog
http://arihazeghiphotography.com/blo...-and-600-f4ii/
Hope you like the image







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