Old Sigma 18mm lens causes Err 01 on Canon DSLR - Photography Stack Exchange
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
Canon : résoudre l'erreur "err 01 : communications between the camera and lens is faulty" - La boîte à idées - Le blog de Jean Chambard
Code Err 01 du Canon EF 24-70 F4 L IS USM – Histoires de photos
Err 01 on Canon 24-105mm f/4L IS USM and getting it fixed in Thailand | Crazy Ivory
ERR 01 | My beloved Canon 5d MK II has failed on me by displ… | Flickr
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