[rollei_list] Re: Cleaning Rolleinars
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Mon, 4 Jul 2011 07:21:45 -0700
----- Original Message -----
From: "John Wild" <JWild@xxxxxxxxxxxxxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Monday, July 04, 2011 3:30 AM
Subject: [rollei_list] Re: Cleaning Rolleinars
For normal dust removal I puff with a puffer brush; for
'stuck' on dirt, the
liquid in a little red bottle (lens cleaner from 30 years
ago) and a small
tear off lens cleaning tissue. Removing any small smears can
take more
gentle wiping than removing the offending mark in the first
place.
By accident, when asked if the filter element could be
changed in a Rollei
bayonet filter, I experimented. I soaked an old well abused
filter in
methylated spirits (shock-horror!) for a number of hours to
loosen the
adhesive. I did wreck the holder in the process; but if I
was going to do
this as a profession, I would make up a couple of collets to
hold the two
halves securely. The join line is not easy to see but with a
wrench on one
side and the other held in a lathe chuck, it came apart.
When I dried the
component parts, I noticed that the filter glass was now
sparkly clear.
Before it had been hazy and well abraded by over cleaning.
The long
immersion in meths had apparently removed the coating and
the signs of
abuse. I would not recommend this for anything of value, but
one of the many
useless Rollei filters in the scrap box at a camera fair
might be worth
experimenting on...
I would be interested for comment as to why meths has
removed the coating.
It was an early bayonet 1 yellow filter (without the size
stamped on it).
The probable answer is that the coating was very soft...
John
If this was a very old filter it may have been coated
with lacquer. If so the methylated spirits would have
removed it. Depending on the lacquer it can be removed with
alcohol or a solution of alkali such as stock Dektol. Some
very early lens coatings were applied chemically and can be
removed by normal cleaning procedures. Kodak applied such
coatings to some of its premium lenses but only on inside
surfaces. I doubt if this is what you encountered. "Modern"
lens coatings, i.e., those available after WW-2 are vacuum
deposited and baked in vacuuo, they are quite hard and can
not be removed by a solvent.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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