The focus screen on my xsi has some dirt on it.... I used a rocket blower on it... but it is still there.... I used it until I got tired (50 pumps or more) .... and this is the thrid time have tried it.... what else can I do?
also I have the dust pump 100/400 and use it in a dusty place.. not sure but I think this is how the dirt got in there....
Any help??
Thanks