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Re: [OM] Multicoating old lenses

Subject: Re: [OM] Multicoating old lenses
From: "M. Lloyd" <royer007@xxxxxxxxx>
Date: Sat, 11 May 2002 20:07:31 -0700 (PDT)
--- Mark Dapoz <md@xxxxxxxxxxxx> wrote:
> On Sat, 11 May 2002, Pete Prunskunas wrote:
> 
> > Is it possible to multicoat an old lens?  Say, if
> you have a single coat
> > lens, can Olympus (or someone else) multicoat the
> lens?  Obviously
> > I am talking about lenses without damage to the
> glass.  If it is possible,
> > is it cost prohibitive and/or a stupid idea?
> 
> Yes, it's possible, there are companies that
> specialise in this type of thing.
> It is very expensive though, count on at least $50
> per element. Cemented
> elements may also have to be separated before being
> recoated.  That would
> add significantly to the total cost.  Usually it's
> only cost effective to do
> this on very expensive lenses, and even then it's
> usually only done on one or
> two elements.
>                                       -mark

Recoating a lens is extremely expensive and usually is
only done to very expensive lenses that have severe
coating flaws. If I had a 250/2 Zuiko that needed it I
might do it but for a 50/1.8 or even 50/2 macro
(unless I basically got the macro for free) I would
not bother. As for multicoating single or uncoated
lenses? I don't think that's possible it would change
the characterisitics of the lens too much. Heck it
might be cheaper to try and get a company to grind you
a new element than recoat an old one

Mark Lloyd

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