a month ago, on our way to a car show , my 24-105L took a dive at least 5 ft down on the asphalt due to my backpack wasn't properly closed. When I fling my backpack to put it on, I saw right behind me -- the lens flying on the air (all in slow motion). This is my first and only L lens, and I thought I was gonna lose it! And we have a wedding shoot the next day too!!, Good thing all the damage was just the filter -- though it was a great $80 filter too.