« on: July 02, 2014, 08:14:59 AM »
Have you tried your 70-200mm with 2x MKIII?
Try it out first before hand you may surprise yourself at how good it is! Certainly did for me.
The most challenging thing is keeping the bird in frame with a prime its even more difficult if its flying toward you. With the zoom my technique is to track the bird at 70mm (140mm with the 2x) then as its coming toward you zoom into 400mm or what ever tele you need to try to fill the frame. Its a lot easier but obviously you loose a little AF speed canon quote 75% but I think this is worst case scenario from digital picture review he explains how the AF speed isn't really an issue with MKII lenses and MKIII extenders. I didn't have any trouble following Puffins and they are quick and unpredictable.
Next on my list is a MKIII extender I think
Its OK but the tamron leaves the 70-200 +2x mk3 combo for dead as far as servo performance goes IQ i guess is not too different and this is coming from a once confirmed Tamron hater! i still carry the 2xTC with the 70-200 as an in case but if I know i'll be shooting long stuff I take the tamron