EF400 2.8

Its the only white lens that didn't get an optical upgrade in the latest batch of re-designs...the mkI was probably Canon's sharpest white lens. The mkII is lighter and technically a better lens (AF, IS etc) but optically it's pretty much the same. The canon 400mm f2.8 LIS is an amazing optic. It's the only lens I know where it doesn't need stopping down with a 2x tc if you use a tripod and live view focusing.
 
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