Good discussion. Note there is a good independent servicing mob in Sydney. I can only say this on the basis of one job, but I had a lens repaired & serviced by them in April and they were very good to deal with (talk direct to service tech) and fast. No BS, and lens as good as new. I had spoken to canon (shield your eyes chaps :stir) in Melb but wasnt happy with their telephone advice. A professional photographer friend gave me the name and details of this mob in Sydney, and I went from there. If you ever want the name, just ask.