Page 6 of 6 FirstFirst ... 456
Results 51 to 54 of 54

Thread: Bergger Pancro 400 in sheets

  1. #51

    Join Date
    Nov 1999
    Location
    San Clemente, California
    Posts
    3,204

    Re: Bergger Pancro 400 in sheets

    Quote Originally Posted by Sal Santamaura View Post
    ...newton rings are almost impossible to avoid in glass carriers. Delta 100 sheet film's emulsion side's glossiness falls between those two, but is much closer to TMY-2's. I've never managed to get a Newton's ring with Delta 100 sheet film. Extreme high humidity ambient conditions might be sufficient to cause them, however.
    Quote Originally Posted by interneg View Post
    Interesting - I've had a hell of a time trying to get rid of Newton rings on a Kodak pin registered contact print frame with both Delta & HP5+ - to the point that getting an AN glass for it seems the only solution - and room humidity isn't higher than about 55%.
    Please note that my post referred to film's emulsion side contacting bottom glass in a negative carrier. With contact printing, your rings are coming from the film's base side touching frame glass. Every sheet film I'm aware of does that (except 320TXP, which has a dull base-side retouching coating) and almost demands anti-Newton glass when contact printing. This also applies to a glass negative carrier's top glass. All of my enlarger glass carriers are configured with plain bottom and anti-Newton top glasses.

  2. #52
    Drew Wiley
    Join Date
    Sep 2008
    Location
    SF Bay area, CA
    Posts
    11,216

    Re: Bergger Pancro 400 in sheets

    Most of my carriers have AN glass BOTH sides. If it is high-quality AN glass there is no degredation in image sharpness whatsoever. None, nada, nil, nix.

  3. #53

    Join Date
    Jun 2015
    Location
    Glasgow
    Posts
    192

    Re: Bergger Pancro 400 in sheets

    Quote Originally Posted by Sal Santamaura View Post
    Please note that my post referred to film's emulsion side contacting bottom glass in a negative carrier. With contact printing, your rings are coming from the film's base side touching frame glass. Every sheet film I'm aware of does that (except 320TXP, which has a dull base-side retouching coating) and almost demands anti-Newton glass when contact printing. This also applies to a glass negative carrier's top glass. All of my enlarger glass carriers are configured with plain bottom and anti-Newton top glasses.
    Of course - this is obvious & logical, and yet I didn't think this one through...

    The retouching coating would have been pretty common (nearly universal?) in the era of that frame, so it makes sense!

  4. #54
    Drew Wiley
    Join Date
    Sep 2008
    Location
    SF Bay area, CA
    Posts
    11,216

    Re: Bergger Pancro 400 in sheets

    I just masked some Bergger 200. It's a luxury. Neither side is terribly smooth.

Similar Threads

  1. New film from Begger! BERGGER Pancro 400
    By vinny in forum Darkroom: Film, Processing & Printing
    Replies: 74
    Last Post: 5-Nov-2017, 20:16
  2. Bergger Pancro 400 - 5x7 film
    By sepstein17 in forum Darkroom: Film, Processing & Printing
    Replies: 7
    Last Post: 4-May-2016, 17:35

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •