K-amps said:Here is another thought...
Consider a 2x mk.iii TC and use it on your 70-200mk.ii
I do the same and I rarely take out my 100-400L, but use the 70-200mk.ii + 2x mk.iii combo for most trips. The IQ is very comparable to the standalone 100-400L even though in absolute terms one could argue for the other. I find the combo has more gradiation in shadows, while the 100-400L has more contrast (both at 400mm), contrast is fixable in PP. I AFMA'ed my 70-200mkii + 2xmk.iii combo and it is very close in sharpness to the 100-400L. But if one splits hairs, one could call the 100-400L sharper in a controlled test... but in the field I doubt you will see the difference most of the time... the difference is probably more of academic in nature.
This will cost you less than $500 plus you can use the 2x on other lenses too.
I'm actually considering getting the 2xIII also. I thought I'd never go more than 1.4x on the 70-200 2.8II, but after hearing that people were getting pretty good results with the 2x, I have now changed my mind. This is good because it makes more sense to have 400mm rather than just 280, even though you are losing a cpl of stops.
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