https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/EOS-R5-Err-01-with-Tamron-lens/m-p/470547#M114228 <P>I just purchased a Canon R5. I use a Tamron 150-600 tele-zoom lens. Before purchasing the camera, I tested my lens on a new R6 at my local Best Buy, and it worked fine. My R5 will not connect to my Tamron lens. I keep getting the Err 01 message. Communication between the devices is faulty.</P><P>What can I do?&nbsp;</P><P>Thank you!</P><P>Bob McMullen.</P> Tue, 02 Apr 2024 13:29:24 GMT bmcmullen 2024-04-02T13:29:24Z https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/EOS-R5-Err-01-with-Tamron-lens/m-p/470547#M114228 <P>I just purchased a Canon R5. I use a Tamron 150-600 tele-zoom lens. Before purchasing the camera, I tested my lens on a new R6 at my local Best Buy, and it worked fine. My R5 will not connect to my Tamron lens. I keep getting the Err 01 message. Communication between the devices is faulty.</P><P>What can I do?&nbsp;</P><P>Thank you!</P><P>Bob McMullen.</P> Tue, 02 Apr 2024 13:29:24 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/EOS-R5-Err-01-with-Tamron-lens/m-p/470547#M114228 bmcmullen 2024-04-02T13:29:24Z https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/EOS-R5-Err-01-with-Tamron-lens/m-p/470555#M114231 <P>Did you try at BB with the same adapter you are using now? Is it the Canon adapter?</P> Mon, 01 Apr 2024 20:55:28 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/EOS-R5-Err-01-with-Tamron-lens/m-p/470555#M114231 kvbarkley 2024-04-01T20:55:28Z