[Konvas] lens coating

[H. W. Stone]

 A number of years ago I was up at a lens manufacturer's coatings lab--? and please forgive me if I don't say who, where, or when for other reasons-- and they chemically removed the coatings, not physical polish removal.? Part of the problem was knowing which solvent to use for which coating, but they had a dozen cabinets where the elements were stripped, each with a different solvent.? They "edge masked" the glued elements, wiped and dried them, and then did the recoatings later in another room.

They swore that the solvents that worked on the coatings would not hurt the glass, but were death to Canada Balsam, just in case you want to play.



 


 

-----Original Message-----
From: Steve Morton <steven.morton at sci.monash.edu.au>
To: Konvas Discussion List <cinema at konvas.org>
Sent: Tue, 7 Oct 2008 5:46 pm
Subject: Re: [Konvas] lens coating










I'm fairly sure no camera techs actually do lens recoating. It is a very 
specialised job. Firstly the old coatings must be VERY carefully 
polished off without changing the curvature of the glass element, then a 
new layer or layers are applied to very tight tolerances generally in a 
high vacuum. It's not too hard finding companies that apply optical 
coatings, much harder finding optical technicians who can remove the old 
coatings?
?

Cya?

Steve?
?

?

_________________________ 



 

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