Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,536   Posts: 1,544,097   Online: 998
      
Page 3 of 5 FirstFirst 12345 LastLast
Results 21 to 30 of 49
  1. #21
    clay's Avatar
    Join Date
    Nov 2002
    Location
    Asheville, North Carolina
    Shooter
    Multi Format
    Posts
    1,118
    Images
    8
    I've done the direct reversal method. It is remarkably straightforward and I got a usable negative the first try. I have by no means mastered the process, but it certainly seems like a relatively painless way to go.

  2. #22
    roy
    roy is offline
    roy's Avatar
    Join Date
    Sep 2002
    Location
    West Sussex
    Shooter
    Medium Format
    Posts
    1,305
    Quote Originally Posted by clay
    I've done the direct reversal method. It is remarkably straightforward and I got a usable negative the first try.
    Interesting, I shall try it. I have only used the interpositive/negative way up to now.
    Roy Groombridge.

    Cogito, ergo sum.
    (Descartes)

  3. #23

    Join Date
    Jul 2003
    Location
    Texas
    Shooter
    Multi Format
    Posts
    3,576
    Images
    27
    Clay, could you elaborate or point us to a link? Sounds interesting, but not sure I completely understand..are you talking about basicly making a b&w transparency?

    Thanks,
    Mike C

    Rambles

  4. #24
    clay's Avatar
    Join Date
    Nov 2002
    Location
    Asheville, North Carolina
    Shooter
    Multi Format
    Posts
    1,118
    Images
    8
    Basically, you are doing the same process involved in transparency processing - you are creating a silver image that is subsequently bleached away, and the remaining silver is a negative of the positive image that was removed. This remaining silver is then developed in room light to create another negative image that duplicates the original negative. There is a good article on unblnkingeye :
    http://unblinkingeye.com/Articles/NbyR/nbyr.html
    that explains the process in detail. Also click the link the Liam Lawless article and read that article. The only thing i would recommend is doubling the concentration of the sulphuric acid in the bleach if you are using common auto battery acid to make it. And wear gloves and safety glasses whenever you mess with this sort of stuff!

  5. #25
    David A. Goldfarb's Avatar
    Join Date
    Sep 2002
    Location
    Honolulu, Hawai'i
    Shooter
    Large Format
    Posts
    17,284
    Images
    20
    Just checking in after a long day at the Jagiellonian Library here in Cracow. Glad to see this thread has taken off, and I've already learned a few things.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

  6. #26

    Join Date
    Jul 2003
    Location
    Texas
    Shooter
    Multi Format
    Posts
    3,576
    Images
    27
    David, I agree - I think the subject could become a forum topic if it wanted to.
    Mike C

    Rambles

  7. #27

    Join Date
    May 2003
    Posts
    336
    I have had great success with two options. If the enlarged negative is to be 10" X 12" or less, then I use a direct duplicating orthochromatic film and post-flash it to produce the base mask (I think that is what it is called). If the enlarged negative is to be larger than 10" x 12" then I use direct duplicating mylar or duplicating paper with the same post flash. Works great, and none of the back and forth. Just do it. by the way all of this processes in regular Dektol.
    Embrace **it! **it. . .just another name for fertilizer. . . Grow baby Grow!

  8. #28

    Join Date
    Jul 2003
    Location
    Texas
    Shooter
    Multi Format
    Posts
    3,576
    Images
    27
    Clay, Thank You for your input. Will check out the link and YES, familiar with the acid and will head the advice...
    Mike C

    Rambles

  9. #29
    b&wisbest's Avatar
    Join Date
    Dec 2008
    Shooter
    35mm
    Posts
    3

    Making contact negatives

    I hope that this is the appropriate forum for this query.
    I am about to do a project in alternative processes, (two colour gum dichromate) requiring enlarged 10" x 8" contact negatives using two identical negatives but different exposures. I will use orthochromatic sheet film.
    Can anyone advise me on which developer/fix combination I should use?
    Any advice would be appreciated.

  10. #30
    David A. Goldfarb's Avatar
    Join Date
    Sep 2002
    Location
    Honolulu, Hawai'i
    Shooter
    Large Format
    Posts
    17,284
    Images
    20
    Since this is a question that comes up often, I've made this a sticky thread and merged today's query with it.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

Page 3 of 5 FirstFirst 12345 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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