The camera has to be set to Automatic to detect the coding. It it's on manual, it must be set manually. However, from what I've seen, I don't think there is much going on with the settings other than the metadata having the focal length and maximum aperture of the lens mounted. Most of the adjustments made via the coding on when on the M8 have be eliminated (as has the need for IR filters). I accidently shot some with an IR filter still mounted, and did not a little subtle vignetting, but that was all. The camera seemed to work well whether I set the proper code, had a coded lens on auto or not.