Most lenses have a 1 year warranty, and is verified with the warranty card + receipt together. Also, read the following thread...hmm guys, need advise here, going to buy a lens from a fellow CSer, but the thing is how i ensure i can use the warranty?
"Warranty: Tagged with kit lens. Able to transfer when the deal is sealed. "
and do i need just the warranty card or i need a receipt as well?
However, if it is extended warranty from places like Harvey Norman... what I understand is that the extended warranty is not transferable. You can read the fine print of the HN warranty terms and conditions.
So... please check before you hand over $$$ to buy if warranty is important to you...