Originally posted by PentaxPZ And what is SDM?
Pentax's version of HSM, USM, etc., (in-lens focusing motor).
Dust Buster is great to have, but as has been mentioned, you will need a bulb blower too.
I wouldn't file a complaint just yet. First thing you need to do, and
do it right away, is to contact the seller. Will he give you a price break? Full refund? Replacement? Find out what he has to say.
If he (or she) is unresponsive, then contact your credit card company to dispute the charge and then notify ebay.