If the lens and camera contacts are dirty, wipe them with a clean, dry cloth, being careful to not scratch the contacts. ... When cleaning the lens contact, be careful to avoid scratching the lens surface. If the contact area is particularly dirty, contact a Canon customer service center for assistance . ... If you are unable to make an improvement after checking these settings, contact a Canon customer service center for assistance . If a malfunction occurs when using a non-Canon lens, contact the lens manufacturer for assistance .
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