seller should read the terms and conditions of warranties by nikon.

as far as i know, any manufacturer would honour the warranty if the items is faulty because of MANUFACTURING DEFECTS within a period of time. but warranty void if the item became faulty because of USER MISUSE..

it's like u buy a new car..
whatever part of the car that is faulty by manufacturing defects would be covered by warranty. BUT..
If u crash it, do you expect the manufacturer to honour the warranty? common sense..

same case with this lense..