If you go through zeiss I believe you're going to have to send it to their international sales dept in NJ, I would look up their phone number and give them a call. They'll tell you exactly what to do. My understanding is that if it has to be repaired they'll send it back to one of their factories in germany. You're probably looking at 3-5 weeks turn around. If it's simple adjustment that a local shop can do for you, you might want to consider doing that instead. Although you might be voiding the remaining warranty by letting someone else touch it, so I would definitely figure out the warranty terms before you let a local shop touch it.