Nikon Corp. said it will fix digital cameras at no charge after claims on Chinese state-run television that product defects caused "black spots" on photographs.

The camera maker will service its D600 digital cameras even after warranties expire, spokesman Ryota Satake said after China Central Television (CCTV) showed hidden-camera footage of customers demanding refunds and exchanges while local service staff blamed dust and smog for the spots.

Nikon's alleged defects were highlighted in a broadcast Saturday marking World Consumer Rights Day, an annual program that has previously targeted such companies as Apple and Volkswagen. The show also alleged that a business owned by Datang's Gohigh Data Networks Technology Co. helped plant software in mobile phones to collect private information.