photo developing too fast (8sec..)

Discussion in 'The Darkroom' started by lieven van meulder, Oct 3, 2018.

  1. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    You'll need to either:

    1. stop the lens down further
    2. use a different paper
    3. use an ND filter in the enlarger
    4. use a lower wattage bulb in the enlarger
    5. use a dimmer on the enlarger bulb


     
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  2. lieven van meulder

    lieven van meulder TPF Noob!

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    My enlarger is a Durst M605 .
    the enlarger has a set of 3 color filters: Cyan, Magenta and Yellow.
     
    Last edited: Oct 4, 2018
  3. dxqcanada

    dxqcanada Been spending a lot of time on here!

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    You printing 35mm negs ? with a 50mm lens and single condenser ?
     
  4. webestang64

    webestang64 Been spending a lot of time on here!

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  5. lieven van meulder

    lieven van meulder TPF Noob!

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    Don't know what you mean by that.. single condenser?
     
  6. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    Dial in equal amounts of C, M and Y. That will effectively be an ND filter.
     
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  7. lieven van meulder

    lieven van meulder TPF Noob!

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    Hi Sparky,

    Thank you sooo much . Didn't know that you could make your own ND filter like that...:)

    Will try it tomorrow...
     
  8. ac12

    ac12 No longer a newbie, moving up!

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    I agree with Sparky about the CMY filters to create an ND filter.

    I have a Durst M600, and like you the exposure time was way too short, with the standard 150w bulb and the lens closed down all the way. I replaced the 150w bulb with a lower wattage 75w bulb, to reduce the light. But the light was not reduced enough, I still had relatively fast exposures of about 10 seconds. I really needed a 30w bulb, to get to a 20+ second exposure. That enlarger was BRIGHT.
    Next step would have been to screw a 2-stop ND filter onto the lens, to get the light level down further.
     
  9. compur

    compur Been spending a lot of time on here!

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    Enlarger brightness can be reduced with a variac or auto transformer.
     
  10. ac12

    ac12 No longer a newbie, moving up!

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    Won't that also change the color temp of the bulb.
     
  11. compur

    compur Been spending a lot of time on here!

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    Yes, it can and you may have to compensate via filtration when using VC papers.
     
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