Archived posting to the Leica Users Group, 1997/10/18
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]The M cameras have an optical registration 1mm less than that of the LTM cameras, to allow the 1mm adapter rings to be used with no loss of infinity focus. There are minor variations in these rings over the years, including a run of 'serial numbered' ones which none of us can figure out. Early ones are marked in cm, later ones in mm, as are the current ones produced by J Uhl in Germany. Simply put, though, the rings match the framelines of the camera. 50mm gives 50mm in an M3 and the 50/75 in M2 to M6. The 90mm gives 90mm in the M3 and 28/90 in M2 to M6. The 135mm gives 135mm in the M3 and 35/135 in M2 to M6. Some were marked '28 - 50' as, in the pre-M4-P days, no cameras had a 28mm frameline, so an auxiliary finder was used and the 50mm frameline in the RF/VF was as good as any. Marc Marc James Small Cha Robh Bas Fir, Gun Ghras Fir! FAX: +540/343-7315