Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 68,693   Posts: 1,482,466   Online: 966
      
Page 2 of 16 FirstFirst 1234567812 ... LastLast
Results 11 to 20 of 155
  1. #11
    daveandiputra's Avatar
    Join Date
    Jul 2010
    Location
    Jakarta, Indonesia
    Shooter
    35mm RF
    Posts
    192
    What about acrylic sheets? Can it be used? This is the easiest to obtain in my place, even easier than thin glass.

  2. #12
    dwross's Avatar
    Join Date
    Feb 2004
    Location
    Oregon Coast
    Shooter
    Multi Format
    Posts
    785
    Quote Originally Posted by Athiril View Post
    dwross, if one wanted to some day attempt 61mm width/120 roll, what width would you get 9962 in?
    Hi,

    hrst's answer was very thorough. I can add an example and a couple of comments.

    I've been working on standardizing my workflow. I love experimenting and playing, but ever since I finally, really got it that handmade emulsions are up to the task of serious photography, I only want to be out and about with my cameras. That means getting serious about darkroom quality and efficiency. I've made up six identical 5-inch emulsion coaters with 4+ inch /11 cm wells. On film, that makes an almost 5-inch path. I'm using them for film for my WP and every size down, including roll film. That size path is perfect for two rolls of 120 or three rolls of 127. In the attached Whole Plate photo, you can see the fall-off on the edges. The film is 6-3/8 inches wide with a good 5-inch path of emulsion, plus selvage edges. You could either cut off the selvages for smaller formats, or as I'm doing with my WP, incorporate the edges into the final print. By cutting the width to the final format, before coating, I only have to make one cut to length after the emulsion is dry. I do cut off the selvages for roll film. The thinner roll film is easier to cut than the thicker sheet film.

    A good method for cutting roll film is to take a roll of commercial film, with a tiny bit of the width trimmed off, and attach it to two pieces of aluminum frame (Nielsen type) with foamcore board holding them apart to the right width. Clamp at the top, hold firmly at the bottom, use a sharp X-acto blade, and perfect film each time.

    David,
    Acrylic is very hydrophobic. If you want to use it, I'd love to see you develop a good subbing formula/strategy. I hope you do and have great luck.

    d
    Attached Thumbnails Attached Thumbnails NOAADock-WP.jpg  
    Last edited by dwross; 05-10-2012 at 10:24 AM. Click to view previous post history.
    www.thelightfarm.com
    Dedicated to Handmade Silver Gelatin Paper, Film, and Dry Plates.

  3. #13
    kb3lms's Avatar
    Join Date
    Jun 2006
    Location
    Reading, PA USA
    Shooter
    35mm
    Posts
    626
    Images
    4
    I wouldn't bother trying to coat a pre-cut material because of the problems of emulsion leaking out or not filling the whole substrate.
    Yeah, I can confirm that trying to coat a pre-cut to size piece of substrate doesn't work well. You will have to get used to the idea of imprecision and some loss. On the other hand, I have cut leftover edges as small as 35mm single frame "sheets" for testing. Tape the small single frame sheet to a piece of black construction paper if you like to fit in your SLR. A nice thing about doing this is you dont have to try and make and run a roll of film if you are trying to decide on developing procedures, etc, and aren't using large format cameras. You could probably come up with some sort of paper film holder that would fit inthe back of an SLR. (Hmmm) Done this with 120 in my Yashica TLR as well.

    I now coat by fastening the substrate to a sheet of 1/4" thick plate glass. I have a few of these as leftover glass shelves from a display case. You can find something cast-off or I believe even new plate (window) glass is not very expensive. It's flat and holds heat well so your emulsion doesn't start to set up on you while you try to coat. (warm the glass a bit before coating)

    To help make certain I have covered the area I need to coat without overdoing it, I have made up some paper templates for 120 rolls that I tape to the underside of the glass. Now you can see the template through the substrate and glass and make certain you have covered the proper area and try to avoid creating waste. I have templates made for one roll, two rolls and three rolls.

  4. #14
    holmburgers's Avatar
    Join Date
    Aug 2009
    Location
    Rochester NY (native KS)
    Shooter
    Multi Format
    Posts
    4,400
    Images
    2
    Fantastic contributions from everyone, thank you all!

    So, this is why I started this thread... I had no idea about these 3M products!

    3M Hydrophilic Polyester Film 9962
    3M Hydrophilic Polyester Film 9960

    Game = changed!

    Dave, I suspect that acrylic would be prone to the same issues as polyester, but IDK. You could try "roughing up" the surface with a fine sand paper if the gelatin comes off though.

    I also like Umut's idea of etching the surface somehow. Ultimately, as hrst suggests, corona treatment, once properly sorted out, is a home-run as well.

    Maybe the situation isn't as dire as I thought afterall. Though it would be nice to know if any of these aqueous ink-jet type PET films will take an emulsion well. It seems that if they will, then so should overhead transparency paper like Pictorico.

  5. #15
    daveandiputra's Avatar
    Join Date
    Jul 2010
    Location
    Jakarta, Indonesia
    Shooter
    35mm RF
    Posts
    192
    Quote Originally Posted by dwross View Post
    David,
    Acrylic is very hydrophobic. If you want to use it, I'd love to see you develop a good subbing formula/strategy. I hope you do and have great luck.

    d
    Any pointers or links to read about it?

  6. #16
    dwross's Avatar
    Join Date
    Feb 2004
    Location
    Oregon Coast
    Shooter
    Multi Format
    Posts
    785
    Quote Originally Posted by holmburgers View Post

    So, this is why I started this thread... I had no idea about these 3M products!

    ...It seems that if they will, then so should overhead transparency paper like Pictorico.
    Don't be afraid to read The Light Farm. All info, as I learn it, open source / free of charge. I talked about the 3M films months ago.

    If you mean the stuff made for digital negatives (??) , it doesn't work.

    d
    Last edited by dwross; 05-10-2012 at 11:11 AM. Click to view previous post history. Reason: can't seem to spell my way out of a paper bag, and blind to boot.
    www.thelightfarm.com
    Dedicated to Handmade Silver Gelatin Paper, Film, and Dry Plates.

  7. #17
    dwross's Avatar
    Join Date
    Feb 2004
    Location
    Oregon Coast
    Shooter
    Multi Format
    Posts
    785
    Quote Originally Posted by daveandiputra View Post
    Any pointers or links to read about it?
    Sorry, no. As far as I know, it's virgin territory and any discoveries could belong to you . If I were feeling adventurous, I'd probably start with the same subbing as for acetate. But, that's purely a guess.

    d
    www.thelightfarm.com
    Dedicated to Handmade Silver Gelatin Paper, Film, and Dry Plates.

  8. #18
    holmburgers's Avatar
    Join Date
    Aug 2009
    Location
    Rochester NY (native KS)
    Shooter
    Multi Format
    Posts
    4,400
    Images
    2
    Quote Originally Posted by dwross View Post
    Dont' be afraid to read The Light Farm. All info, as I learn it, open source / free of charge. I talked about the 3M films months ago.
    d
    Yes, shame on me!

  9. #19
    kb3lms's Avatar
    Join Date
    Jun 2006
    Location
    Reading, PA USA
    Shooter
    35mm
    Posts
    626
    Images
    4
    We'd really need to set up a group purchase of the 3M film. $1200 is a little too much for my budget, although I agree it's the way to go.

  10. #20
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    22,710
    Images
    65
    We might try a purchase of film support just as we did the baryta recently made available via the Formulary.

    We could get custom cuts of actual subbed supports currently in use for films. And, they would be in the appropriate thicknesses.

    PE

Page 2 of 16 FirstFirst 1234567812 ... LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin