https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/R5-Registered-C3-is-disabled/m-p/347874#M78568 Check your Custom Settings. On the 1D X III only C1 and C2 are active in factory settings. Thu, 22 Jul 2021 21:57:11 GMT jrhoffman75 2021-07-22T21:57:11Z https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/R5-Registered-C3-is-disabled/m-p/347867#M78567 <P>R5 - I registered C3 with some custom settings but can’t choose it from the Mode dial. Why is it greyed out?</P> Thu, 22 Jul 2021 19:12:06 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/R5-Registered-C3-is-disabled/m-p/347867#M78567 TimBirder 2021-07-22T19:12:06Z https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/R5-Registered-C3-is-disabled/m-p/347874#M78568 Check your Custom Settings. On the 1D X III only C1 and C2 are active in factory settings. Thu, 22 Jul 2021 21:57:11 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/R5-Registered-C3-is-disabled/m-p/347874#M78568 jrhoffman75 2021-07-22T21:57:11Z https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/R5-Registered-C3-is-disabled/m-p/347877#M78569 <P>Thanks for your response! I figured out how to customize this in Menu, Custom, Restrict Shooting Modes, Enable, Detail Set. Then check or uncheck the modes needed. Whew!</P> Thu, 22 Jul 2021 23:29:23 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/R5-Registered-C3-is-disabled/m-p/347877#M78569 TimBirder 2021-07-22T23:29:23Z