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Originally Posted by adan
While I have not seen anything definitive about the 16/18/21 (none have been released even for review yet), I expect Leica used the same system. No useful framing information (since there are no built-in frames for those focal lengths), but electronic info, in combination with the zebra coding, to ID the chosen focal length for corrections and EXIF.
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Indeed, the 3 position frame selection lever is sensed with the existing TE to determine which of the 3 focal lengths is selected.
If the new TE I saw at Photokina was representative, they have not replicated the same mechanism in the new lens. As Andy says, there are no built-in frames for this lens but there is only a single coding in the bayonet ring so the camera cannot tell what focal length is in use. I don't know which of the three frame sets is selected - there must be one because there isn't a "none" option.
Tough to know what the camera will show with lens recognition enabled on the display and the file header and since the cyan problem with 486s gets progressively worse the wider you go, not knowing the focal length selected might prevent adequate correction with this lens.
Wouldn't surprise me if the lens was going to be modified to communicate the selected focal length, either by using the frame selection lever or, potentially, by changing the code when you change the focal length setting.
Just one more bullet item on Leica's "issues" list.