I believe that I remember Don Goldberg telling me years ago when he worked on my old 5 cm screw mount Summicron that almost all of the screw mount lenses had soft coatings inside. Cleaning would reduce the coatings.
Tim Ellestad-----Original Message----- From: Richard Knoppow
Sent: Saturday, March 02, 2013 2:29 PM To: rollei_list@xxxxxxxxxxxxx Subject: [rollei_list] Re: OT: Leica lens polishing----- Original Message ----- From: "Jan Decher" <jdecher@xxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Saturday, March 02, 2013 12:34 AM
Subject: [rollei_list] OT: Leica lens polishing
Hi Everybody:
Does anyone know a good lens polishing/re-coating service in
Europe? I bought some Leica SM gear with 2.8/5cm and 4/9cm
Elmars that are both fogged inside.
Happy shooting this weekend.
Jan
I suspect this is just haze. I've found a lot of
lenses develop a haze inside, I don't know the cause but it
may be from lubricant or from the anti-reflection paint.
Usually this stuff comes off with plain lens cleaner. The
problem is getting to the internal surfaces. I think Leica
uses retaining rings on both ends so they may be easy to get
off. The arrangement of the lens mount of almost all lenses
with spherical surfaces is such that they are automatically
centering. Elements can be lifted out using sticky tape like
Scotch Tape or masking tape. The Elmar is a fairly simple
lens but has two air spaces both of which should be opened.
Unless this lens had very early soft coating it can be
cleaned without any damage to the coating. It should not
need re-polishing unless the surfaces have been scratched or
etched by fungus.
--
Richard Knoppow
Los Angeles
WB6KBL
dickburk@xxxxxxxxxxxxx
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