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You might find the articles in this site here: Juza Nature Photography
of interest in helping you with your choices - the author also provides a slightly different view to the use of 2*Teleconverters. Another consideration is weight and travel - 600mm f4 is very nice lens but also a heavy beast to use on a full day shooting. I know several shooters who use a lighter 300mm f2.8 IS plus a 2*TC (including the linked site above) and whilst there is an image quality drop it still delivers very usable images. However I should note that the quality of camera body you use is going to come into play here as well - upper end camera bodies are preferable over lower end camera bodies when using such a combo (its something to do with pixel densities and sizes but I can't recall enough details to give a firm answer myself).
Suffice to say it might be worth considering a good lighter lens if you find yourself spending long days on the move - rather than a heavier (albeit better lens) which might leave you far more strained come the end of a day.
of interest in helping you with your choices - the author also provides a slightly different view to the use of 2*Teleconverters. Another consideration is weight and travel - 600mm f4 is very nice lens but also a heavy beast to use on a full day shooting. I know several shooters who use a lighter 300mm f2.8 IS plus a 2*TC (including the linked site above) and whilst there is an image quality drop it still delivers very usable images. However I should note that the quality of camera body you use is going to come into play here as well - upper end camera bodies are preferable over lower end camera bodies when using such a combo (its something to do with pixel densities and sizes but I can't recall enough details to give a firm answer myself).
Suffice to say it might be worth considering a good lighter lens if you find yourself spending long days on the move - rather than a heavier (albeit better lens) which might leave you far more strained come the end of a day.