Re: FINGER PRINT ON LENS

[seungmin@luxmail.luxcom.com]

     Hi,
     
      Some time ago at San Mateo camera show, I was buying a R lens from a 
     reputable Leica specialist.  He said that late Leica lenses are so 
     hard-coated that I could clean it with no fear.  I am reluctant to 
     clean the lens, though.
     
     Regards,
     David

______________________________ Reply Separator _________________________________
Subject: FINGER PRINT ON LENS
Author:  leica-users@mejac.palo-alto.ca.us at Internetmail
Date:    8/4/97 10:28 AM


To the Leica Users Group
     
The Following is a message from a friend, I am reproducing it here, I will 
forward him  any answer.
     
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Last Saturday the son of a close friend of mine, put his little finger on 
the back element of my 35 Summilux AHSP, when I realized that I tried to 
remove it with a dry microfiber cloth (according to  the Leica 
instructions), but what happened was that the print wasn=B4t cleaned at all, 
instead, the dirt was all over the back lens, since this is the first time 
it happens to me,  I decided leaving it like that and ask for advice, my 
question is :
     
How could I remove that dirt without removing (or scratching) the coating of 
the back element ?
     
From that problem a big question is arising now, How hard is the coating, 
and the glass, of Leica Lenses ?, I know there are lenses like the 19mm 
f/2.8 R that uses back mounted filters, and many Leica users don=B4t like 
using front filters, in that case a lens should be cleaned quite often.
     
Andres
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Thanks in advance,
     
Jorge Saravia