http://www.nikonchat.com/nikon-usa-warranty/

What is the difference between the international model and U.S. model the Nikon D300?
I found a gray market camera Japanese model Nikon D300 for very cheap, but I was told that the only difference is the warranty .. Is there anything else I should consider?
Warranty. Nikon USA will not warranty repairs on non-U.S. market cameras. Some places, like B & H Photo, will guarantee the repair of the things that sell gray market. If you're spending $ 1700 is good to have the guarantee of honor in the U.S.. If the price is too good, make sure it includes all accessories (see the B & H Photo web site so you should be in the box). Http: / / www.bhphotovideo.com/c/product/518489-REG/Nikon_25432_D300_SLR_Digital_Camera. html # include Be aware of bait and switch tactics, even if you are buying from a store front. If mailing, which had strayed from this agreement. Check the contents box before leaving the store.
Nikon Tc-20EII 2x Telephoto Converter with NIKON USA WARRA
One Comment
First, While B&H does sell some “grey market” film slrs, lenses and speedlights, we have not and do not sell any “grey market” digital cameras.
Second, it is true Nikon USA has promised they will never work on any “grey market” Nikon product, in or out of warranty.
Finally, it may be more difficult to obtain firmware updates from Nikon USA’s website if your camera is “grey market.”
Henry Posner
B&H photo-Video