Hello Magoose,
From what you describe of this issue it sounds as though there is either something either on the lens or embedded inside the lens. If cleaning the lens with a cleaning kit does not resolve the issue then you may need to consider sending this to Canon for evaluation. We do not recommend that you attempt the repair yourself.
To arrange for service, or to contact Canon directly, please visit the service and support section on our web site at your earliest convenience. You can arrive directly there through this Link.
Did this answer your question? Please click the Accept as Solution button so that others may find the answer as well.
