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By using Canon TCs and retaining AF, the longest FL one can normally do within the Canon system is 1200mm FL, i.e., 600mm f/4 prime + 2xTC.
Obviously for those that can (or like to) focus manually, sky is the limit. However, we usually do not see too many long range BIF shots focused manually.
I haven't done much shooting with (600 f/4 IS MkII + 2xTC MkIII) combo this winter for a couple of reasons:
(1) Poor light has been prevalent, and my 1DX has not been updated to the f/8 AF firmware version yet, thus I had to use 1DMkIIN or 1DsMkII which do not excel at high ISO.
(2) Almost constant wind in my winter shooting "theatre" by the lake has had an adverse impact on the IQ of a large lens such as 600, particularly when extended to 1200mm. Shooting without the (huge sail-like) hood is also not the best idea from the IQ standpoint, particularly when surrounded by light reflecting ice and snow.
However, whatever I have done so far looks fairly good, and even a couple of BIF shots I got were surprisingly adequate. Here is the latest such shot. If I told you that the keeper rate was OK, I'd be trying to deceive you....in fact, it was very very low. However, I am hoping that 1DX will AF noticeably better at f/8 than my 1DsMkII.
The example below was shot handheld: 1DsMkII + 600 II + 2xTC MkIII.
Edited on Mar 06, 2013 at 02:51 AM · View previous versions