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Error 01 , communication between camera and lens faulty. Clean lens contact” | DIGITAL CANON repair blog
EOS RP + EF to R Adapter + EF 1.4 Teleconverter = Err 01: Canon EOS R Talk Forum: Digital Photography Review
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Received an error code 01 on a 24-105mm I USM F.4, solutions? Already cleaned contacts too : r/canon
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