Canon Knowledge Base - Error 01 displayed on an EOS Mirrorless Camera.
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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Error 01 , communication between camera and lens faulty. Clean lens contact” | DIGITAL CANON repair blog
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Err 01 Communications between the camera and lens is faulty. Clean the lens contacts Quick Fix - YouTube
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AF (Autofocus) does not work. (EOS DIGITAL REBEL XS/EOS 1000D)
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Received an error code 01 on a 24-105mm I USM F.4, solutions? Already cleaned contacts too : r/canon
Canon err 01 fix. 3 ways how to fix faulty lens communication Canon Camera - YouTube
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Canon recommended to clean lens contacts: Canon EOS 7D / 10D - 90D Talk Forum: Digital Photography Review
Do NOT erase your camera contacts to clean them – Sheldon Carpenter Photography
Canon Knowledge Base - Keeping lens contacts clean on the EOS M50
Cleaning Your Camera Lenses With Isopropyl Alcohol and Purosol
