Nick, Sorry to hear about your trauma. 1st, let me say I fully understand how a lens can become unmounted. Just last week I noticed my 500 rotating oddly on the camera body; but luckily it was on the car seat when I noticed it. I also had an experience where my 24-105 rolled off the countertop on to a concrete foundation---That cost my insurance company $180. My guess is that your lens will be ok if you can retrieve it and yes-----rinse it well with clean water upon retrieval----then call Canon and cross your fingers. Did you have insurance?.

Also, If canon gives you specific instructions on what to do with a "drowned" lens, please share. It would be nice to know in the event it ever happens to anyone else.

When I dropped my 24-105, The Canon Tech rep told me that they have a fixed cost for repairs on lenses. In other words, no matter what is wrong with a particular lens they have one price that they charge. I don't know if I beleive this, but it's just info that might be useful to you.


Good Luck