https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/what-do-you-do-with-an-error-50/m-p/107463#M12478 <P>Did you happen to format the CF card in a different camera (or computer)&nbsp;and then try to use it int the 50D? &nbsp;It could be that simple. &nbsp;Always format with the camera you intend to use, nothing else.</P><P>Another thing you might try is clean the contacts on the lens and camera with denatured alcohol. &nbsp;Are you using a real Canon lens?</P> Thu, 31 Jul 2014 15:26:05 GMT ebiggs1 2014-07-31T15:26:05Z https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/what-do-you-do-with-an-error-50/m-p/107433#M12476 <P>I have a canon 50D</P> Thu, 31 Jul 2014 04:52:19 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/what-do-you-do-with-an-error-50/m-p/107433#M12476 paathn 2014-07-31T04:52:19Z https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/what-do-you-do-with-an-error-50/m-p/107457#M12477 <P>Unfortunately it's a general error for an "internal problem".&nbsp; You'll have to send it in for a diagnostic.</P> Thu, 31 Jul 2014 14:43:25 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/what-do-you-do-with-an-error-50/m-p/107457#M12477 Skirball 2014-07-31T14:43:25Z https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/what-do-you-do-with-an-error-50/m-p/107463#M12478 <P>Did you happen to format the CF card in a different camera (or computer)&nbsp;and then try to use it int the 50D? &nbsp;It could be that simple. &nbsp;Always format with the camera you intend to use, nothing else.</P><P>Another thing you might try is clean the contacts on the lens and camera with denatured alcohol. &nbsp;Are you using a real Canon lens?</P> Thu, 31 Jul 2014 15:26:05 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/what-do-you-do-with-an-error-50/m-p/107463#M12478 ebiggs1 2014-07-31T15:26:05Z