(100 - 400) or (70-200 2.8 + 300 4L+ 1.4x III/ 2x III) for wildlife photography

Started May 9, 2013 | Discussions thread
qianp2k
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Re: (100 - 400) or (70-200 2.8 + 300 4L+ 1.4x III/ 2x III) for wildlife photography
In reply to Shilpaksphotography, May 10, 2013

Shilpaksphotography wrote:

i have recently bought a 7d and only have the 18-135 that came with the body. i know this question has been done to death but i have only always found a 100 - 400mm compared to either 70-200+1.4/2x or 300 4L+1.4. but im an avid (albeit amateur) wildlife photographer. what would be a better addition to my lens collection in the long run (i intend to upgrade to a full frame at some point much later) especially considering most of the wildlife/safari photography is done in low light conditions (at dawn/ dusk)
70-200 + 300 f/4 + 1.4x/ 2x 
100-400mm +1.4x/2x
i understand the budgets for these two would be a little different but that's not a constraint unless it makes more sense to buy the 100 - 400 for now and save the rest for a 400 2.8 or 500 4 prime. 
please advise.
shilpa

Usually it's hit with TC no matter from which lenses, more or less. The better lenses (usually those super tele prime), better with TCs. Among your list for wildlife purposes at 400mm from respective of AF speed, optical quality and sharpness, 100-400L > 300L+1.4x TC > 200L II + 2.0x TC. I am sure for the 1st and 3rd setup as I own both not quite sure on 2nd set but with a TC in compromise in general. I will not be surprised that a bare 300L/4.0 > 70-200L II + 1.4x TC.  300L/2.8 IS II or I that works best with TC is a very different animal and likely beats all others at 400mm side.

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