Yeah I figured if I'm gonna get the 2x converter for my 70-200 f4 is at home. But it would also be fun to have the 100-400 and be able to make it a 200-800. The 2x converter makes it an f/5.6 when used anyway. I would probably like to upgrade my 70-200 to the 2.8 IS first though. Such a baller lens, despite the weight.
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