Hey Julie,

Weather proofing is a wonderful thing...though I am not sure what system could help you with all the dust in the barn. This is an area that Olympus had really done a nice job with on the market.

Having said that, there are other alternatives. For example, I normally shoot weddings with two cameras on my body...one with a wide angle lens and one with a medium zoom. This eliminates any need to switch lenses during an event. I do this not because of concern for dust, but because I hate fiddeling with lenses during an event. Many people like lenses that cover an entire zoom range of 28-200. Not my cup of tea, but they do work.

Nice shots!
-JM