jjjjuin Posted October 7, 2009 Share #1 Posted October 7, 2009 Advertisement (gone after registration) what's the difference between coded lens and uncoded lens? Link to post Share on other sites More sharing options...
Advertisement Posted October 7, 2009 Posted October 7, 2009 Hi jjjjuin, Take a look here a novice question here. I'm sure you'll find what you were looking for!
ho_co Posted October 7, 2009 Share #2 Posted October 7, 2009 A coded lens has a set of six black or white stripes on the bayonet, which a set of six diodes in the bayonet of the camera can read. In combination with the position of the frame preview lever, they tell the M8 or M9 which lens is mounted. Information on the coding of specific lenses is available at Leica M8 Lens Codes, but that's probably at a level of detail beyond what you're looking for. Here's a diagram from p 2 of the M9 instruction manual, showing the diodes within the bayonet. Link to post Share on other sites More sharing options...
lars_bergquist Posted October 7, 2009 Share #3 Posted October 7, 2009 I can only add that the coding has two purposes. The first, which is vital to M cameras, is to correct vignetting (light fall-off toward the corners of the image) and colour shifts that are lens-dependent and cannot be combated by more generalised means. The corrections are effected by software, before the camera writes the image file to the card. The other purpose is to write lens focal length and maximum aperture to the images' EXIF file, where you can read it later. The old man from the Age of Vacuum Tube Electronics Link to post Share on other sites More sharing options...
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