Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 69,755   Posts: 1,515,980   Online: 905
      
Results 1 to 7 of 7
  1. #1
    dustym's Avatar
    Join Date
    Oct 2005
    Location
    Essex, just outside London
    Shooter
    Multi Format
    Posts
    165
    Images
    9

    Pinhole light leak

    From top of neg to bottom in a arrow head shape the apex of the leak in top slap bang in the middle of the top edge and then flares out to the bottom edge 5x4 negative.
    Is this likely to be a leak from the pinhole rather than the back. The d/slide held in place via 2 tensioners d/slide exposed side sealed by black felt.

    rgds
    The camera cannot lie, but it cannot help being selective.

  2. #2

    Join Date
    Dec 2002
    Shooter
    Large Format
    Posts
    6,242
    Quote Originally Posted by dustym
    From top of neg to bottom in a arrow head shape the apex of the leak in top slap bang in the middle of the top edge and then flares out to the bottom edge 5x4 negative.
    Is this likely to be a leak from the pinhole rather than the back. The d/slide held in place via 2 tensioners d/slide exposed side sealed by black felt.

    rgds
    Why don't you find out difinitively rather than considering a bunch of guesses? The way to do this is to remove the lens board and while in a dark room insert a light through the lens board opening and shine it around inside the camera bellows with a holder in place in the back. The light leak will show up.
    Art is a step from what is obvious and well-known toward what is arcane and concealed.

    Visit my website at http://www.donaldmillerphotography.com

  3. #3
    dustym's Avatar
    Join Date
    Oct 2005
    Location
    Essex, just outside London
    Shooter
    Multi Format
    Posts
    165
    Images
    9

    Its a wooden box pinhole

    Quote Originally Posted by Donald Miller
    Why don't you find out difinitively rather than considering a bunch of guesses? The way to do this is to remove the lens board and while in a dark room insert a light through the lens board opening and shine it around inside the camera bellows with a holder in place in the back. The light leak will show up.
    .

    The lens board is static, I supopose I could shine a light through pinhole but this would not give the integrity of the seal around the darkslide.but it will tell me if there is a leak around the pinhole mount.

    Thanks Donald
    The camera cannot lie, but it cannot help being selective.

  4. #4

    Join Date
    Jan 2006
    Location
    Melbourne
    Shooter
    Multi Format
    Posts
    140

    pinhole light leak

    Try covering the darkslide with cloth when making the exposure, if it still shows flares after that then I suggest it could be flaring off the actual pin-hole especially if it is made of tinfoil/aluminium or such. But, sometimes these can be capitalised on!

  5. #5
    dustym's Avatar
    Join Date
    Oct 2005
    Location
    Essex, just outside London
    Shooter
    Multi Format
    Posts
    165
    Images
    9
    The pinhole is bare metal aluminium , should I try darkening it
    The camera cannot lie, but it cannot help being selective.

  6. #6
    Jim Jones's Avatar
    Join Date
    Jan 2006
    Location
    Rural NW Missouri
    Shooter
    4x5 Format
    Posts
    1,770
    Quote Originally Posted by dustym
    The pinhole is bare metal aluminium , should I try darkening it
    Yes! Even a small felt tip pen will darken it better than nothing. Check for residue after darkening it. Since good pinholes are easy to make, you might consider making one out of brass shim stock, usually available at hardware or hobby shops. It works cleaner than aluminium. Also, a "lens hood" sometimes eliminates stray light.

  7. #7

    Join Date
    Jan 2006
    Location
    Melbourne
    Shooter
    Multi Format
    Posts
    140

    pinhole light leak

    From my experience the flare is moderated by the thickness of the aluminium. One way to avoid it can be to make the hole and around it a darker colour, texta pen could do this. Also, make sure every surface inside the camera is black, preferably matt-black. I'm not sure if you know but there is a pinhole website online, I'm not sure of the technical content but it's called f295 and similar in set-out to APUG. I've used handmade exposure apparatus for years, p.m. me if you need some more info. I wouldn't call myself a technical expert but I have years of experience. Good luck.



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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