[pure-silver] Re: Newton... Re: donut solution; enlarger lens problem
- From: "mail1" <mail1@xxxxxxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 11 May 2007 22:38:21 -0700
Condit mfg. supplied coated glass for my 4x5 pin registration carrier which
I use for bottom glass to eliminate Newton rings on the emulsion side.
Condit is no more and I have located a Local supplier which I plan on
visiting shortly for replacements for my 6x7 glass which is showing wear.
Jonathan Ayers [mail1@xxxxxxxxxxxxxxxxx]
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Richard Knoppow
Sent: Friday, May 11, 2007 10:00 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Newton... Re: donut solution; enlarger lens
problem
----- Original Message -----
From: "Peter De Smidt" <pdesmidt@xxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, May 11, 2007 10:20 PM
Subject: [pure-silver] Re: Newton... Re: donut solution;
enlarger lens problem
> Some emulsions sides of film can be shinier than they used
> to be, and this can lead to newton's rings between the
> emulsion side of the film and the lower glass in the
> carrier frame. For example, Howard Bond has anti-newton
> glass both above and below his large format TMX and TMY
> negatives. He says that there isn't any apparent
> degradation from the lower glass, but this would depend on
> the fineness of the anti-newton glass and the
> magnification. In other words, coarse anti-newton textured
> screens and/or high magnification make degradation more
> likely.
>
I don't know if anyone has made anti-Newton-ring glass
using an anti reflection coating similar to that used on
camera lenses but I think it would work. There is such glass
made for mounting artwork to reduce the reflection of
ambient lights so it should not be too expensive, at least
for a trial. The index of refraction of both gelatin and
support are greater than air so the coating may not be
effective for them but if it works it would be better than a
rough surface.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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