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"Old school film camera manufacturer Leica has taken yet another step towards the scary new world of filmless shooters by announcing that the majority of its lens lineup will receive 6-bit coding for use with the company's upcoming Digital M model. Save for the 135-millimeter APO-TELYT-M, all current Leica lenses leaving the factory after July 1st will sport marks representing binary numbers on each of the six fields in the bayonet ring, which the Digital M will optically read in order to optimize image quality. Luckily for current Leica lens owners, many models released after 1963 can be retrofitted with the coding for use with the M, although the procedure will set you back $175. Non-coded lenses will still work with the M -- which is scheduled for release by the end of the year -- but they will not be able to take advantage of the image enhancements or EXIF-ready data offered by the new models."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2006/06/12/leica-coding-lenses-to-prep-for-digital-m-slr/>