Im not looking at it as a problem because if it was a major problem then more poeple would be voicing it, I would like to know if anyone has had experience with this question. But if it does have some suction that is bringingdust into the inner workings that isnt good, even being an "L" lens if air is entering and leaving because you are expanding the chamber inside then dust as well could get in....and out....


Thanks


Joel


p.s. There's enough posts of information on the advantages and disadvantages of certain lenses, but this topic hasnt come up as far as I know so lets try to keep it at that...no hard feelings just dont want this topic to become a debate between lens choices.