Yes, I have done that with 4 lenses: Canon 17-85 IS, Canon 35 f/2, Canon 70-300 IS non-DO and Canon 100 f/2.8 macro. The lenses were bought in Canada and brought back to Singapore for calibration (and also repair in the case of the 35 f/2). Didn't trust the Canadian technicians. :bsmilie: :bsmilie:
You only need the warranty card and original receipt.
When i sent in all my lenses for calibration, my 300F4L IS had a Malaysian warranty card (international) and they still took it into account so it isn't an issue.