Hi,
I'm really torn on a super long zoom lens... I have the Canon 70-200 2.8L IS and it's a terrific lens - well sealed against the elements I most commonly shoot in, like motocross and 4x4 truck racing. It's terribly dusty, or, it's raining.
I'm looking for a little more reach to shoot in the same conditions. The 100-400mm Canon lens tops my list because of the quality I get from my other glass.
However - I've heard rumors that the push/pull zoom type is prone to "sucking dust" into the lens. My 17-85mm EF-S was terrible for sucking dust in, and it's the reason why I leave my 24-70 2.8 at home for these brutal events.
So; What are my options for a long zoom that can compare with the image quality of the 100-400mm Canon lens? (or better?!)
Many thanks!
-- Chris.