6-bit coded Leica M macro telephoto, digital-optimised version with auto lens correction on digital M bodies.
The Leica Macro-Elmar-M 90mm f/4 with 6-bit coding is the digital-compatible version of the M-mount macro-capable telephoto, featuring electronic coding for automatic lens profile correction on digital M bodies. The 6-bit coding distinguishes it from earlier non-coded versions.
The 6-bit coded mount communicates lens identity to digital M bodies, enabling automatic correction of vignetting and colour shifts that occur with wide-angle and telephoto lenses on digital sensors. This version provides the same optical quality and macro capability as the non-coded variant with added digital convenience.
Build quality is identical to the non-coded version with modern Leica M manufacturing standards. The 6-bit coding is the primary differentiator, making this version the preferred choice for digital M body users who want automatic lens correction profiles applied to their images.
The 6-bit coded Macro-Elmar-M 90mm f/4 commands a slight premium over non-coded versions on the used market due to the digital M body compatibility. For photographers shooting digital M bodies, the 6-bit coding provides genuine convenience advantages worth the premium.