Disposable Lens Brush

From Rollei Mailing List;
Date: Fri, 12 Jan 2001
From: Richard Knoppow dickburk@ix.netcom.com
Subject: RE: [Rollei] Coatings in World War II

you wrote:
How about the coatings right after WWII? Does this mean that we have be extremely careful with the coated Tessars of the late Automats?
Siu Fai

No, these are hard vacuum coatings, probably made of Magnesium flouride, which is fairly hard. I am not sure what "extremely careful" means, I would be careful of any lens. Some optical glass is pretty soft and coatings are softer than some glass. Cleaning should be done with the object of keeping grit of any sort from getting trapped and rubbed against the glass.

Tissue used for cleaning should be used once and discarded. I don't like the use of lens brushes, which an pick up grit and scratch the next time they are used, a one-time brush can be made of lens tissue by rolling into a tube, tearing the end and folding the torn ends so they face the same way. Use this once and toss it.

Some lenses I've seen look like they were scrubbed with a pad of steel wool.
Richard Knoppow
Los Angeles,Ca.

Source: http://medfmt.8k.com/bronrecoatings.html