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  1. #1

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    Massive contact printing troubles

    Well as of late I have been using my contact-printing frame on a daily basis with no troubles at all, but today I noticed I am getting Newton rings everywhere, all over the place. I took the glass out and washed it several times and let dry. Then even went so far as to dry with a hair dryer and still everywhere! Nothing I do can get rid of it, nothing!

    ERRRRRRR

    Now here is the thing if I put the emulsion side to the glass no problems and no rings but if I flip it over the correct way slippery side to glass rings everywhere to the point I cant make a print without it showing up.

    I have a spilt back frame. What can I do as I have prints that have been ordered that I need to get out. I have never seen it before until today!

    Please help or any advice would be greatly appreciated.

    Thanks,

    Kev

  2. #2
    David A. Goldfarb's Avatar
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    There are two types of glass used to eliminate Newton's rings--textured glass and anti-reflective glass. Steven Shuart sells AN glass, but I'm not sure which type. If you have a framer near you that sells Denglas, it has an anti-reflective coating, so it might supress Newton's rings.

    There is also an Anti-Newton spray that acts a bit like a dulling spray, and that could work. Haven't tried that one myself.

    An old trick is to brush the shiny surface of the neg with cornstarch or talcum powder. Sounds messy and I haven't tried it myself.

    Are you shooting T-max film? I find I get more Newton's rings with T-max. You might look for a film that has retouching surfaces on both sides, which will suppress Newton's rings.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
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  3. #3

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    I am using HP5 and have made tons of contacts in the last month. But all of a sudden today I started getting them. I have no idea as to why and never had them before.

  4. #4
    JBrunner's Avatar
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    I haven't ever had this happen to me, but if it did... what have have been the changes since you last printed successfully? Temperature, humidity, paper, etc?

    Or maybe more likely...

    Have the springs on your frame weakened? Try inserting a piece of mat board behind the paper to restore pressure.. I believe that to form the rings there would have to be intermittent contact, but I'm not sure.

  5. #5

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    The only thing that has changed is the tempeture. It has heated up big time lately. That is the only thing I can think of. I just hope I can print as I am in a bind...

  6. #6

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    Kevin,
    From what I understand, Newton's Rings occur in relation to the relative humidity and are most pronounced under situations of higher humidity. I don't know where you live in Ca but here in Phoenix we recently switched to the annual summer monsoons when the dew point climbs up into the mid 50's and low 60's. So it may be that you have had a change of similar nature.

    I have heard that a light dusting of talcum will sometimes solve the problem without resorting to AN glass. If you decide to try this, I would apply the talcum to the glass surface (immediately adjacent to the film), shake it to distribute, and then pour off the excess.

    I am not sure that Denglass would serve to eliminate the problem since it is a parallel and smooth glass surface. The problem is due not so much to reflections as it is to humidity and altered contact between the film and glass.
    Art is a step from what is obvious and well-known toward what is arcane and concealed.

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  7. #7

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    I am up near Yosemite about 3500 feet. Tonight it says it is at 40% humidity.

    I am going to give up at this point. I am going to try this; 1/4" closed cell foam on enlarger baseboard, then a tight weave cotton flannel on top of that. Then the paper then the neg then a 11x14 1/8" peice of glass on top of that. I am hoping the the foam and flannel will keep even contact with just the weight of the glass on top.

  8. #8
    David A. Goldfarb's Avatar
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    Newton's rings are interference patterns caused by reflections between a curved surface (the film) and a flat surface (the glass). Some enlargers and scanners have glass with anti-reflective coatings, and this is described as "Anti-Newton Glass," as is glass with a textured surface. I've had both, and while the textured surface is more effective in reducing the problem of Newton's rings, the downside is that a textured surface can also sometimes have an effect on resolution.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
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  9. #9

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    Well I have tried everything and no matter what peice of glass I use I am having the exact same problem. I had the AC running today and that is the only thing I can think that changed. I will have to wait until tommorrow... So frustrated...

    Thanks for all the replies...

  10. #10

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    Hope you've had some success resolving this problem - or at least managed to get a little sleep... I read your posts in addition to your email, and it sounds like you may have eliminated the frame as a source of the trouble. I'm glad to hear that, but still hope I can help. I'm not clear on one point... Have you printed this particular negative before without the Newton's Rings showing up? I guess that's is an obvious question, but it's the only one I can think of. It sounds like you're down to either the film or the environment as the cause.

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