Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,280   Posts: 1,534,885   Online: 840
      
Page 2 of 3 FirstFirst 123 LastLast
Results 11 to 20 of 21
  1. #11
    gainer's Avatar
    Join Date
    Sep 2002
    Posts
    3,726
    Images
    2

    Where is ir darker?

    Quote Originally Posted by dancqu View Post
    As I understand it the drag in bromide drag is a drag in
    development resulting is less density. My vote is for
    surge marks, essentially greater local agitation. Dan
    Tell me again how we know the negative is darker next to the sprocket holes.
    Gadget Gainer

  2. #12

    Join Date
    Dec 2006
    Location
    Minden Hills, Ontario, Canada
    Shooter
    Multi Format
    Posts
    214
    I vote for surge marks from over-agitation, or
    vigorous inverting of developer tank.

    /Clay

  3. #13

    Join Date
    Jan 2005
    Location
    Kalix, Sweden
    Shooter
    35mm
    Posts
    29
    Quote Originally Posted by gainer View Post
    Tell me again how we know the negative is darker next to the sprocket holes.
    We know it from the width of the darker bands being smaller than the lighter ones,
    since the holes are of less width than the space between the holes.

    Best wishes,

    Jan Johansson

  4. #14

    Join Date
    Sep 2002
    Location
    Willamette Valley, Oregon
    Shooter
    Medium Format
    Posts
    3,684
    Quote Originally Posted by gainer View Post
    Tell me again how we know the negative is
    darker next to the sprocket holes.
    I took it that a scan of the negative was pictured.
    As mentioned the dark lines are more narrow. Dan

  5. #15
    Bob Carnie's Avatar
    Join Date
    Apr 2004
    Location
    Toronto-Ontario
    Shooter
    Med. Format RF
    Posts
    4,651
    Images
    14
    This is the third thread in less than three weeks that shows uneven development at the film processing stage. All cases have plus density on the positive which would indicate minus development on the neg.
    This seems to be a more common problem .
    Nuetral skys and grey background seem to be affected the worst.
    Photographing 18% grey cards *filling the frame with grey* and then trying different agitation and processing techniques will help solve these problems.

  6. #16
    gainer's Avatar
    Join Date
    Sep 2002
    Posts
    3,726
    Images
    2
    Quote Originally Posted by janjohansson View Post
    We know it from the width of the darker bands being smaller than the lighter ones,
    since the holes are of less width than the space between the holes.

    Best wishes,

    Jan Johansson
    Not that different. As I said, I have had the streaks emanate from the space between the holes. It would be nice to have the testimony of the originator. Not that it is life threatening or even reputation threatening, but that it is possible. I use quite vigorous agitation in a wire reel and have never in over 50 years of doing so have seen streaks such as these. The only time I have seen them is with stand processing with developer that was too concentrated.

    I think if you tried to duplicate these streaks by excessive agitation you would fail. They are too long. Besides, how in the world would one get the developing solution to flow through the holes? I'm trying to visualize the flow pattern, but cannot.
    Gadget Gainer

  7. #17
    percepts's Avatar
    Join Date
    Sep 2005
    Location
    Sceptred Isle
    Shooter
    4x5 Format
    Posts
    263
    these marks are usually caused by tipping your tank over too slowly and chemicals then pour through the holes. Speed up you inversion.

    rotary processors use constant agitation so how some people think it is too vigorous agitation I have no idea. Very vigorous agitation would not give the well defined lines you have.
    Percepts,
    An old dog learning new tricks...

    Black and White Landscape Prints

  8. #18
    gainer's Avatar
    Join Date
    Sep 2002
    Posts
    3,726
    Images
    2
    The idea of gentle agitation has come upon the scene rather lately. Before, it was either vigorous or none, as by Mortenson. Now, if one practices gentle agitation and gets uneven development, the theory is that the agitation was not gentle enough. To be sure of that conclusion, I suggest you use violent agitation and see if the problem gets worse. My opinion is that gentle agitation moves the products of oxidation around but does not distribute them evenly, thus causing flow patterns to show in the negative. If you agitate at all, do it thoroughly so as to get a uniform mixture.
    I frequently use a two reel tank with one reel in it free to move and with the tank full. If I were trying to get the surge patterns, this would be the best way, as the reel moves through the liquid with considerable velocity when I invert the tank. Eddy currents around the wire rims should show, I would think. I NEVER have gotten any such evidence. Therefore, my advice is all or nothing, and stand development should only be used with very dilute developers or you will get flow patterns due to local changes in temperature and specific gravity that accompany any chemical reaction.
    Gadget Gainer

  9. #19
    KenM's Avatar
    Join Date
    Apr 2003
    Location
    Calgary, Alberta
    Shooter
    4x5 Format
    Posts
    800
    Quote Originally Posted by gainer View Post
    The idea of gentle agitation has come upon the scene rather lately. Before, it was either vigorous or none, as by Mortenson. Now, if one practices gentle agitation and gets uneven development, the theory is that the agitation was not gentle enough. To be sure of that conclusion, I suggest you use violent agitation and see if the problem gets worse. My opinion is that gentle agitation moves the products of oxidation around but does not distribute them evenly, thus causing flow patterns to show in the negative. If you agitate at all, do it thoroughly so as to get a uniform mixture.
    I frequently use a two reel tank with one reel in it free to move and with the tank full. If I were trying to get the surge patterns, this would be the best way, as the reel moves through the liquid with considerable velocity when I invert the tank. Eddy currents around the wire rims should show, I would think. I NEVER have gotten any such evidence. Therefore, my advice is all or nothing, and stand development should only be used with very dilute developers or you will get flow patterns due to local changes in temperature and specific gravity that accompany any chemical reaction.
    Absolutely correct.

    If you increase agitation, you increase the 'randomness' of the movement of the developer, thereby avoiding surge marks.
    Cheers!

    -klm.

  10. #20
    Charles Webb's Avatar
    Join Date
    Nov 2004
    Location
    Colorfull, Canon City Colorado
    Shooter
    Multi Format
    Posts
    1,723
    I am certain it's agitation.

    Charlie....................................

Page 2 of 3 FirstFirst 123 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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