Archived posting to the Leica Users Group, 2001/05/28
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 11:48 PM 5/27/2001 -0400, Douglas Cooper wrote: >Ken Ruth (another >legendary repairman) told me that it's impossible to grind and recoat a lens >without doing damage. I hate to speak for Ken, but the above certainly does NOT reflect more than ten years of conversations I have had with him on this topic. I would suspect that Ken probably gave you VERY cautious advice, along the lines of 'regrinding of a lens can change the optical performance'. In any event, most "cleaning marks" on older Leica glass are not "cleaning marks" at all, but artifacts of the wet coatings used by Leica until 1958; these coatings dry out and leave identifiable marks on the lens. Having these removed and the lens recoated will not alter the optical properties, as no glass is removed. A true nick or ding or gouge is a different matter: if the lens is otherwise all right, then perhaps the best thing to do is to blacken the gouge with a magic marker of some sort to reduce flare. Marc msmall@roanoke.infi.net FAX: +540/343-7315 Cha robh bas fir gun ghras fir!