Thomas Camera Services Ltd - #Error01 on a Canon EOS 650D. This fault can be caused by either the body or the lens. For example: lens contact issues on the body or
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troubleshooting - My Canon DSLR is showing "Err 01" — should I send my camera for service? - Photography Stack Exchange
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Error 01 , communication between camera and lens faulty. Clean lens contact” | DIGITAL CANON repair blog
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