How much cheaper is it to buy a Canon camera in Japan? Should a tourist visa be tax-free? Do you sell it in the duty-free shop? Is to go to Canon.

Ordinary cameras are about a quarter cheaper, and professional SLR is about a third or more cheaper.

One won't be taxed.

You can use a specialty store or a larger electrical appliance store.

Can't adjust Chinese! This is the biggest problem, but you can exchange Chinese instructions for free in domestic stores.