M8, Zeiss lens, and data bars

[ChrisC]

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According to Michael Reichmann, the 6 bit data bar on new M lenses:

 

"......tells the camera the focal length, maximum aperture and other information about the lens. This information is used by the camera to pre-condition the raw file so the raw converters can accomodate vignetting correction and provide EXIF information. Older M series lenses can be updated...."

 

Zeiss lenses will not have a data bar.

 

With regard to the missing data bar; how effected is image APPEARANCE from a Zeiss 25mm. lens M8 DNG file rather than one from a current Leica 24mm. lens? I am unclear how the vignetting information is utilised at the file processing stage.

 

Yours Sincerely..........Chris.