TT, you shoot with the 580 mounted via camera hotshoe or off cam?
I have the 580EXII as well and in reality it's overkill unless you shoot fast or with multiple Canon EX flashes where E-TTL comes into play but shooting E-TTL is no fun. Not saying I don't like mine but on camera flash is boring anyways, and only when a person understands light and off camera flash will they learn more of being a photog, is what I have experienced.
As far as filters I know all "L" lenses are sealed but from what I have gathered from a many photogs "L" lenses are only fully sealed with a filter mounted to them.
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2006 Porsche Boxster S/Atlas Grey Metallic/Black/Black/6 spd
Canon 30D/17-85 IS/70-200 4L IS/580EXII/430EX/B+W Filters
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