Printers: Need help with Newton rings problem

[andre_noble]

Dear printers, despite using anti-Newton top glass in my Omega D-5 condenser head, I am still get frustrating Newton rings. I just read a one year old thread that suggested contacting Beattie to have a sheet of multicoated bottom glass custom made to fit my 4x5 glass carrier. Anyone else have experience with this method?

 

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I am also interested in hearing any other solutions you may have success with such as that "neg-flat"? carrier made by Zone VI or Anti-Newton sprays, etc. Detailed info would be nice since I plan to solve this problem using your help. Thank you very much. Andre Noble

[trevor_crone1]

Andre, I've had the same problem and I solved it by using an anti-newton glass on the bottom has well. Now this may not work with all AN glasses, it didn't with a Meopta enlarger, this produced an image of the texture of the AN glass. But I've used this method successfully with both Durst and now my DeVere.

 

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The problem seems to only occur with film with a "shiny" emulsion surface, eg. Agfapan, Delta, T-Max.

I think it's worth giving it ago, if it dosn't work you've just got a spare AN glass without going to too much expense.

Good luck,

[sean_yates]

Zone VI's "Neg-a-flat" is actually an old idea. They made the

carrier adjustable for film thinckness and marketed it better. B&J

and others have made simpler versions in the past. I have two I got

at various camera store "Fire Sales". IMHO they work quite well, but

I have no experience with the Zone VI product.

 

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Beseler makes a clamping carrier that I have seen but never used - I

could never afford one - even used they are expensive. The one I saw

looked like it would do a better job - but it was only available in 4

X 5.

[brian_ellis3]

You are putting the base (shiny) side of the negative against the

anti-newton glass, right?

[andre_noble]

Sean, Trevor thanks for reply will try Anti Newton glass on the

bottom glass too. Yes, Brian, I did have AN glass on the shiny (top)

side. Since I was using Ilford Delta 100 4x5 film when getting an

rings,presumed it was coming from bottom side, but I may be wrong

about that. Andre

[steve_clark1]

I`ve often had similar problems, try raising or lowering the humidity

in your darkroom. Steve Clark