flare light

Discussion in 'Enlarging' started by rmolson, Jan 6, 2011.

  1. rmolson

    rmolson Member

    Messages:
    306
    Joined:
    Feb 23, 2006
    Location:
    Mansfield Oh
    Shooter:
    Medium Format
    Enlarger light leaks

    After a frustrating morning of trying to arrange a dark cloth to plug all the light leaks from my B22 negative carrier I lost all my enthusiasm for printing . Guess I’ll have to build some kind of box to go over the head and mask out all the stray light As the coin on the fogged side paper test showed a large amount of flare light .
    Is there any enlarger that doesn’t leak light from it’s negative carrier ,especially if the film is in strips?
     
  2. tkamiya

    tkamiya Member

    Messages:
    4,252
    Joined:
    Oct 3, 2009
    Location:
    Central Flor
    Shooter:
    Multi Format
    My Omega D-2 and D-II leaks light at condenser/negative-carrier junction but the direction of leak is horizontal. Not enough of it actually reach the baseboard to cause problems.
     
  3. chimneyfinder

    chimneyfinder Member

    Messages:
    90
    Joined:
    Mar 31, 2007
    Location:
    Cardigan, We
    Shooter:
    Multi Format
    If you haven't already done this, having the wall, or a board, behind the enlarger painted black usually helps and rather than cover the head (a 'skirt' of black felt around the negative stage should help alot) and/or prop another black board between the enlarger and processing area and only have the enlarger on when focussing on the easel, not on the paper with the red filter in place. Never having had a B-22, I've never had an enlarger with serious enough light leaks to cause fogging provided the rear surface is black.
    Regards, Mark.
     
  4. archer

    archer Member

    Messages:
    232
    Joined:
    Jun 29, 2009
    Shooter:
    4x5 Format
    Dear rmolson;
    when doing internegs with the enlarger, I too was concerned about light spill from the neg carrier so I bought some black velcro and split the width of the hook tape and glued it to the enlarger around the the carrier slot and then bought some black felt and cut a strip 1 1/2 in wide and long enough to encircle the carrier slot. I flipped the material up, slid in the carrier and flipped the material down and with a pair of scissors cut a flap for the carrier handle. No more light spill.
    Denise Libby
     
  5. Nicholas Lindan

    Nicholas Lindan Advertiser Advertiser

    Messages:
    2,386
    Joined:
    Sep 2, 2006
    Location:
    Cleveland, O
    Shooter:
    Multi Format
    The light that is causing problems isn't coming from the enlarger but from the brightly illuminated sheet of photographic paper sitting under the enlarger.

    Try an experiment:
    • Load a negative and a sheet of paper and stop the lens down as for printing;
    • Turn the enlarger on and look around the room at the stray light;
    • Now cap the lens so it doesn't illuminate the paper and again look around the room;
    • The light leaking from the enlarger should be much, much less than the light reflecting off the paper.*

    The proper cure is to paint the area illuminated by the paper with either flat black or flat deep red paint. Draping or boxing the enlarger risks overheating and won't cure the stray light problem.

    (*) Obviously, if the enlarger is severely out of whack or has major parts missing it may be flooding the room with light - the fix then is to fix the enlarger so it doesn't need drapes or boxes.
     
  6. George Collier

    George Collier Member

    Messages:
    1,064
    Joined:
    Feb 23, 2005
    Location:
    Richmond, VA
    Shooter:
    Multi Format
    I use a black head band (as in runner's sweat band) and wrap it around the condenser (Omega D2), then snug it down onto the top of the neg carrier when all is adjusted and in place, then refocus one more time. But there is still a thin slit of light that comes out actually between the two pieces of the neg carrier. Since the film strip usually continues out beyond the edge of the carrier, I don't really have an elegant way of blocking this slit of light. If the wall is black, I don't think it has any real effect.
    I also always wear black clothes when printing. I have a couple of black T shirts I wear only in the darkroom.
     
  7. Petr

    Petr Member

    Messages:
    27
    Joined:
    Jan 3, 2011
    Location:
    Sydney Austr
    Shooter:
    4x5 Format
    Hi George, you could be fogging the paper with your safe light as well. Reflections can also be a problem, have a look what you have hanging on the wall around the enlarger. Painting the area around the enlarger dark grey or black will improve the situation. I have also taped black paper around the the mixing box to hung past the carrier to minimize light leaks. Don't give up, printing is great.
     
  8. Jim Jones

    Jim Jones Subscriber

    Messages:
    2,428
    Joined:
    Jan 16, 2006
    Location:
    Rural NW MO
    Shooter:
    Multi Format
    There is good advice in most previous posts. Blackening the shiny aluminum in all the places that showed light leaks reduced stray light somewhat in my B22. Later negative carriers that fit the B22 are black anodized aluminum.