enables all Contax 645 SLR system lenses to be used on Leica S, S2 and S2-P camera bodies, thus expanding the range of S-system cameras and exploiting the full capability of Contax 645 lenses. The electronic contacts allow full integration of the lenses into the Leica S-system and support all lens functions such as AF (excluding the 120mm f/4 Apo-Makro-Planar manual focus lens), focus confirmation and automatic aperture control. EXIF lens data and correction profiles for Contax 645 lenses are enabled for RAW image conversion. When using Contax 645 lenses, aperture can be selected in manual mode or with the auto setting on the camera.