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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.
    “You often feel tired, not because you've done too much, but because you've done too little of what sparks a light in you.”
    ― Alexander Den Heijer, Nothing you don't already know

  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.
    “You often feel tired, not because you've done too much, but because you've done too little of what sparks a light in you.”
    ― Alexander Den Heijer, Nothing you don't already know

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