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  1. #11

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    AN glass goes only on top side. Bottom is clear or no glass. All my Leica enlargers have AN top and I can not see a difference if I print with a glassless except for corners going out of focus because the neg is not flat.

    Plain glass on the bottom does not make a difference.

    Now 4x5 is even less magnification so there is no chance of seeing anything. My 4x5 carrieres are AN top only, plain glass bottom, or glassless.

    NEVER use AN on the bottom. Guaranteed you will see it big time.

  2. #12

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    Except that Howard Bond used AN glass for both the bottom and top glass plates in his enlarger, since some of the newer films have very shiny emulations, which can lead to Newton's rings. He has fairly high standards for image sharpness That said, AN glass varies in quality, and large enlargements are more likely to show up issues than small ones.

  3. #13

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    Quote Originally Posted by Ronald Moravec View Post
    AN glass goes only on top side. Bottom is clear or no glass. All my Leica enlargers have AN top and I can not see a difference if I print with a glassless except for corners going out of focus because the neg is not flat.

    Plain glass on the bottom does not make a difference.

    Now 4x5 is even less magnification so there is no chance of seeing anything. My 4x5 carrieres are AN top only, plain glass bottom, or glassless.

    NEVER use AN on the bottom. Guaranteed you will see it big time.
    It's counter-intuitive, but bottom AN glass, at least Durst AN glass in a condenser enlarger, will have no visible effect an any enlargement and is, in my experience a necessity for TMX. As I said before, this is something I extensively tested.

  4. #14

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    quote
    If you live in a climate where you're likely to have Newtons Rings - then you don't have much choice - either get some AN Glass or give up printing for those months when you are likely to encounter the problem
    .

    What is a climate likely to induce newton rings please? I have not read this in my research to date, regards

  5. #15
    RalphLambrecht's Avatar
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    Quote Originally Posted by Peter De Smidt View Post
    Except that Howard Bond used AN glass for both the bottom and top glass plates in his enlarger, since some of the newer films have very shiny emulations, which can lead to Newton's rings. He has fairly high standards for image sharpness That said, AN glass varies in quality, and large enlargements are more likely to show up issues than small ones.
    Peter

    Keep in mind that Howard Bond only works in LF. At his magnifications, you would not see the AN glass texture anyway. Also, there is AN glass, and there is AN glass.
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  6. #16
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    Quote Originally Posted by Brad Dow View Post
    It's counter-intuitive, but bottom AN glass, at least Durst AN glass in a condenser enlarger, will have no visible effect an any enlargement and is, in my experience a necessity for TMX. As I said before, this is something I extensively tested.
    For 35mm and even MF, are you not better of leaving the bottom glass out altogether?
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  7. #17
    Martin Aislabie's Avatar
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    Quote Originally Posted by pakeha View Post
    quote
    If you live in a climate where you're likely to have Newtons Rings - then you don't have much choice - either get some AN Glass or give up printing for those months when you are likely to encounter the problem
    .

    What is a climate likely to induce newton rings please? I have not read this in my research to date, regards
    Cool and damp/wet ambient conditions

    The UK and Ireland are great places to get Newtons Rings, particularly in the Winter months

    If you don't live in such Climatic conditions (a cool temperate ambient close to an ocean with predominantly on-shore winds that have travelled extensively over water) then you would be understandably (and luckily) unaware of the problem

    I would presume Norway, Seattle and Vancouver would be similarly affected.

    Martin

  8. #18
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    Quote Originally Posted by Martin Aislabie View Post
    Cool and damp/wet ambient conditions

    The UK and Ireland are great places to get Newtons Rings, particularly in the Winter months

    If you don't live in such Climatic conditions (a cool temperate ambient close to an ocean with predominantly on-shore winds that have travelled extensively over water) then you would be understandably (and luckily) unaware of the problem

    I would presume Norway, Seattle and Vancouver would be similarly affected.

    Martin
    I thought it was the other way around. Newton rings form in too dry conditions and a humidifier actually helps. Have I gotten this wrong?

    Dry would explain the winter months!
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  9. #19

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    Quote Originally Posted by RalphLambrecht View Post
    For 35mm and even MF, are you not better of leaving the bottom glass out altogether?
    I agree.

  10. #20
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    Why glass in the first place, with smaller formats? There seems to be plenty of dof on the enlarger at f/8 or so with smaller formats, and 4x5 seems to stay perfectly flat under its own stiffness. Are you all making big prints that necessitate large apertures or glass to prevent the negative from warping?
    f/22 and be there.

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