its more to user error ithink. my friend said he tried to "wipe" sumting on the mirror of his 450D which i dont know what the sumting is. haha.
now he say the inside is like not that clear. i tried looking at his 450D. cant really see anyting amiss. but he still claimed it's not normal.
i told him, he must be crazy doing that wiping... he has 3 mths of warranty to go.
if really own error, think how much would it cost?