Canon EF 100-400mm f/4.5-5.6L IS II USM Lens
The major difference / visual different between the new Canon EF 100-400mm II v the original Canon EF 100-400mm is that the new lens does NOT have a pump action. The pump action would suck in air and with it a whole pile of yucky stuff. The new Canon EF 100-400mm has Canon's "Air Sphere Coating" whatever that is. (to reduce flaring). On top of that you have some weather sealing as well.
The Canon EF 100-400mm II is without a doubt a heavy bulky lens but try get the Canon L series quality and that 100-400mm range without some quality glass inside.
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