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Lars Johnsson wrote:
And the 200 + 2x is also better than the bare 400/2,8
Even bare 200 f/2 IS doesn't match the obsolete 400 f/2.8 IS MkI regarding IQ and AF performance, let alone when the 200 is coupled with TCs.
We get to read that kind of stuff quite often from all possible sources, from people new to photography to Canon`s own ``ambassadors or explorers of light ``.
However, the unfortunate situation is that if one wants to have the best performing 800mm FL option today, then one needs to spend $14,000 US on 800L. There are certainly cheaper ways to get to 800mm or thereabouts by using TCs on shorter lenses, yet those are not better nor equal options to 800L, even though they could be judged satisfactory or even excellent by some people.
However, IMO the only lens + 1.4xTC combo which has a potential of coming close to the 800L performance is based on 600 f4 MkII. Alas, the 600 II doesn`t exist yet, and thus it would be kind of irrational to be ``evaluating`` its performance against 800L, although that has been done already on different fora including this one.