After watching this I think I'm ok with paying 2499$ for a 70-200.
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Was at a Zoo with Rainforest theme. Went into were the bats were and it was insanely hot and humidity was ridiculous! I spent 15 minutes there before my 200 didn't fog up anymore, I stood on a small bridge where the bats flew by VERY close.
Here is the Video for Lens Compression.
However subject isolation is also a result of magnification as well as distance, so the 5D at 168mm would appear to have a shallower dof for a given same aperture.
I've never used one but I have used the 1Ds mk3 extensively for the last 4 years. This is a full frame camera but I am lead to believe that the 1D mk3 is a crop sensor? the 1Dx is a full frame but the 1D mk4 is crop and a 1Ds mk4 was never produced.