Silvery scratch on lens

I got a lens with a silvery looking scratch on it which I suspect may be
just some metal rubbed off on it from banging around with other lenses.
Is there a way to buff that off or is that what a scratch looks like on
a coated lens? It has a purple/green coating. I tried rubbing pretty
hard with a piece of lens paper and eclipse sensor cleaning fluid. I
tried scratching at it with an exacto knife and it does feel like a
gouge, but it looks like silvery build-up.
Here's what it looks like:
http://www.edgehill.net/1/?SC=go.php&DIR=Misc/photography/scratch

Paul Furman

Re: silvery scratch on lens

"Paul Furman" <paul-@-edgehill.net> wrote
That's consistent with a gouge, or on ebay: 'a minor cleaning
mark'.
From the close-up it looks like it may have been made by
the knurling on a filter ring. Anodized aluminum is plenty
hard enough to scratch glass.
--
Nicholas O. Lindan, Cleveland, Ohio
Darkroom Automation: F-Stop Timers, Enlarging Meters
http://www.nolindan.com/da/index.htm
n o lindan at ix dot netcom dot com


Nicholas O. Lindan

Re: silvery scratch on lens

Hmmm, good idea moving the light around, and yes the lighting was as you
describe.
I tried that and it looks black from the back.
Still, while these suggestions make sense, I now believe it is a gouge;
dropped on concrete or something hard enough to really cut into the
glass. A deep gouge in glass could play tricks on the eye with
reflections & dispersing the light from behind.
--
Paul Furman
http://www.edgehill.net/1
Bay Natives
http://www.baynatives.com


Paul Furman

Re: silvery scratch on lens

I'm thinking dremel tool with a stone grinder next, or a cold chisel &
sledge hammer. LOL
--
Paul Furman
http://www.edgehill.net/1
Bay Natives
http://www.baynatives.com


Paul Furman

Re: silvery scratch on lens

What Nicholas said.


Alan Browne

Re: silvery scratch on lens

Exacto knife didn't work, huh? Maybe a hammer next?
...


Doug Robbins

Re: silvery scratch on lens

Yes. My dad used to use India ink on scratches....I wonder if that lens
scratch filler fluid they advertise on TV will work? - It's a clear stuff
they recommend for using on scratched eyeglasses....


William Graham

Re: silvery scratch on lens

It looks like more than a scratch; it looks like multiple small scratches
that have, in effect, etched the glass. Yes, a metal filter ring contacting
that spot and jiggling against the glass as a camera bag, for instance, was
carried might have caused something like that. It would look the same on
coated or uncoated glass if that's what it is.
Toby


Toby

Re: silvery scratch on lens

@newssvr27.news.prodigy.net:
Get a decent magnifier on it and examine it with a light moving
around it. You should be able to tell if it's a gouge or something on the
surface (and be aware it could be both).
From your closeup pic of the boogie, it looks more to me like
something on the lens, most especially if the light is from the upper right
of that photo. Shadows point towards the light with a scratch (shielded
from the light by being in the valley, so to speak), and away from the
light with something on the lens (far side of the mountain).
Of course, you should also be able to tell by looking at it from
behind (not mounted), especially with a strong light shining directly into
the lens. A gouge should produce glimmers.
- Al.
--
To reply, insert dash in address to match domain below
Online photo gallery at www.wading-in.net


Al Denelsbeck

Re: silvery scratch on lens

On 2006-11-15 19:30:31 -0500, Paul Furman <paul-@-edgehill.net> s
This lens looks like it has been more than banging around. BTW an
eXacto knife is not exactly a recommended lens cleaning tool!
Yes this appears to be a scratch and there is not much you can do about
it Its proximity to the center of the lens means it will affect your
photos. I think its' time to retire this warhorse and replace it.
--
Jim <jen....not....home..remvdots...@....yahoo


Jim

Re: silvery scratch on lens

Have you tried the lenspen? This is the only thing that I use on my
lenses.
http://www.lenspen.com/409
-----------------------------


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