topic Re: Whenever I attach my 100mm macro lens to my Rebel XT, I get an error message "Err 99". in EOS DSLR & Mirrorless Cameras https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/Whenever-I-attach-my-100mm-macro-lens-to-my-Rebel-XT-I-get-an/m-p/126377#M67899 If it only happens with that lens check that the contacts on the lens are clean. Thu, 20 Nov 2014 21:41:12 GMT jrhoffman75 2014-11-20T21:41:12Z Whenever I attach my 100mm macro lens to my Rebel XT, I get an error message "Err 99". https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/Whenever-I-attach-my-100mm-macro-lens-to-my-Rebel-XT-I-get-an/m-p/126347#M67898 Thu, 20 Nov 2014 17:35:30 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/Whenever-I-attach-my-100mm-macro-lens-to-my-Rebel-XT-I-get-an/m-p/126347#M67898 mboadi 2014-11-20T17:35:30Z Re: Whenever I attach my 100mm macro lens to my Rebel XT, I get an error message "Err 99". https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/Whenever-I-attach-my-100mm-macro-lens-to-my-Rebel-XT-I-get-an/m-p/126377#M67899 If it only happens with that lens check that the contacts on the lens are clean. Thu, 20 Nov 2014 21:41:12 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/Whenever-I-attach-my-100mm-macro-lens-to-my-Rebel-XT-I-get-an/m-p/126377#M67899 jrhoffman75 2014-11-20T21:41:12Z