Durst Glass for Negative Carriers

[Neil Poulsen]

I have two sheets of Durst 5x7 negative carrier glass, that's supposed to be anti-Newton. I understand this consists of an etched surface that helps prevent Newton rings.

Does this specialized surface exist on one side of the glass or both? Also, if only on one, how can one tell which side is which?

I've been using it to scan 5x7's on a flatbed, but I've been seeing some Newton rings in the scan.

 

[galyons]

AN surfacing is, generally, only on one side. Hold the glass to get a reflection on the surface. The AN side will appear somewhat matte, the regular glossy.

Which surface of your original are you placing on the scanner platen glass? The scanner glass is usually not AN.

Cheers,
Geary

 

[Muihlinn]

It's supossed that if you meant to scan that on a flatbed like the epsons perfection the resulting image won't be too sharp because you will have many chances to put the negative out of the optimal lens focus, it might be an issue or not, just take care of it and do not blame the glass too soon

 

[Neil Poulsen]

AN surfacing is, generally, only on one side. Hold the glass to get a reflection on the surface. The AN side will appear somewhat matte, the regular glossy.

Which surface of your original are you placing on the scanner platen glass? The scanner glass is usually not AN.

Cheers,
Geary

Sorry for my late response. Actually, I have two of these. They each about 2mm thick, and I plan on sandwiching the transparency between both of them.

I scanned a sample 6x7 negative sandwiched as described above and in the standard template. The scan using the anti-Newton ring sheets of glass was just perceptibly sharper. So, the template height is a little below the optimum scanning height.

Does one ever really need to have an anti-Newton ring surface facing the emulsion? Is the anti-Newton ring glass just usually for the top for the film?

 

[resummerfield]

.....Does one ever really need to have an anti-Newton ring surface facing the emulsion? Is the anti-Newton ring glass just usually for the top for the film?

For my Durst negative carrier, the film emulsion faces the regular glass, as the emulsion side does not normally produce the Newton rings. The matt side of the AN glass faces the non-emulsion side of the film.

 

[Mahler_one]

At the Durst USA site, Mr. Jensen has a small technical page on AN glass. Eric is very correct in that-using the Durst negative carriers- the clear glass is under the emulsion, and the AN glass faces the non emulsion side with the beveled edge down. In addition, there is some information about the new Schott AR ( Anti-Reflective ) glass that is available, and which is said to transmit more light then the Durst AN glass. See www.durst-pro-usa.com, go to "Library", and then "How to care for your glass" for a very thorough explanation of AR glass with further information about the new Schott product. There is no information about AN or AR glass in a scanner. I hope the links help.

Edwin