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Thread: preflashing Direct Positive paper without an enlarger?

  1. #1

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    preflashing Direct Positive paper without an enlarger?

    I don't have an enlarger.

    Id like to try out some DP paper.

    I do have flashed, and strobes... Anyone prefacing with a strobe/speedlight set to 1/32 or 1/64? or any other solutions without an enlarger?

    Thanks...

  2. #2

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    Re: preflashing Direct Positive paper without an enlarger?

    Get a very small incandescent bulb, 5W or 7 1/2W. Mount it in a receptacle about 18-24 inches from the paper. Use either a switch to turn it on and off, or something opaque to block the light path. This was the method used by press photographers 70-80 years ago, and it still works.

  3. #3

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    Re: preflashing Direct Positive paper without an enlarger?

    how long should I pre flash?

  4. #4

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    Re: preflashing Direct Positive paper without an enlarger?

    Depends on the bulb , distance etc. Test, your looking for the first sign of change.

  5. #5

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    Re: preflashing Direct Positive paper without an enlarger?

    Point your camera a white wall. Make sure it's out of focus, preferably with the camera set at infinity. Set the exposure according to previous test results (meter the white wall wall and subtract x stops). Expose the DPP in the camera.

  6. #6
    Gary Beasley's Avatar
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    Re: preflashing Direct Positive paper without an enlarger?

    I made a preflash for printing from a small desk lamp that I wired a dimmer to then hung on the wall over the work table. Hooked to a timer it made for some very easy to control preflashing.

  7. #7

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    Re: preflashing Direct Positive paper without an enlarger?

    So there isn't a hard and fast formula, probably a box to test and then I can get rolling.....??

  8. #8
    Peter De Smidt's Avatar
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    Re: preflashing Direct Positive paper without an enlarger?

    Out-of-focus white wall, a piece of white acrylic in front of the lens...all of those should work. As a starting place, try placing the exposure on Zone 0, i.e. meter it and close down 5 stops.
    J. Haidt's 3 great untruths:
    What doesn’t kill you makes you weaker.
    Always trust your feelings.
    Life is a battle between good people and evil people.

  9. #9

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    Re: preflashing Direct Positive paper without an enlarger?

    Quote Originally Posted by Atracksler View Post
    how long should I pre flash?
    Make test strips. Pick the time which just shows density above paper white.

  10. #10
    Peter De Smidt's Avatar
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    Re: preflashing Direct Positive paper without an enlarger?

    Jim gives good advice. You might also try pre-flashing for the amount just before the time that shows density above paper white.
    J. Haidt's 3 great untruths:
    What doesn’t kill you makes you weaker.
    Always trust your feelings.
    Life is a battle between good people and evil people.

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