https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/EOS-7D-Mark-II-won-t-work-with-Sigma-170-500-APO-lens/m-p/431026#M103334 <P>If this problem only occurs with this lens, the problem is with the lens, not the camera or camera firmware. Perhaps contacting Sigma would be the best option, or return the lens.</P> Mon, 07 Aug 2023 18:27:51 GMT Anonymous 2023-08-07T18:27:51Z https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/EOS-7D-Mark-II-won-t-work-with-Sigma-170-500-APO-lens/m-p/431012#M103333 <P>Just bought a sigma 170-500 mm lens and upon trying it on my canon 7d mkii keeps coming up , please clean contacts on lens.</P><P>I have the latest firmware on, was wondering if i have to go back on the software for it to work.</P><P>Any help would be grateful.</P> Tue, 08 Aug 2023 13:11:55 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/EOS-7D-Mark-II-won-t-work-with-Sigma-170-500-APO-lens/m-p/431012#M103333 Lordmike 2023-08-08T13:11:55Z https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/EOS-7D-Mark-II-won-t-work-with-Sigma-170-500-APO-lens/m-p/431026#M103334 <P>If this problem only occurs with this lens, the problem is with the lens, not the camera or camera firmware. Perhaps contacting Sigma would be the best option, or return the lens.</P> Mon, 07 Aug 2023 18:27:51 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/EOS-7D-Mark-II-won-t-work-with-Sigma-170-500-APO-lens/m-p/431026#M103334 Anonymous 2023-08-07T18:27:51Z