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  1. #1
    IVARTON's Avatar

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    Default Light to screen distance formula

    What is it? I gotta rebuild my exposure unit and im trying to remember how far I should have the screens from the light source. I have 21x32 screens or something.

    Thanks.

  2. #2
    squeegeethree's Avatar

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    Default

    It depends on the light source, but if you double the distance you double the exposure time. If you half the distance you pretty much half the exposure time.

  3. #3
    Premium Member
    crosshair's Avatar


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    Default

    keep in mind, the closer your lights are to the screen, the more light will hit the image at an oblique angle, leading to sawtoothing, loss of detail, etc.
    Crosshair pushing here until its limit the bringing together.

    www.crosshairchicago.com

    "Every single Crosshair poster I've ever seen is almost exactly the same. Do these guys even have a bit of creativity in them? I mean, come one - shitty old building pics photoshopped with text over them. Pretty pathetic to say the least."

    "it just seems like so little effort is put into creating this? am i missing something?"

  4. #4
    IVARTON's Avatar

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    Default

    Screw it ... ill use the old height.

  5. #5
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    Default

    mine are 2" from the glass, never had a real problem that wasn't related to something else.

  6. #6
    Premium Member
    crosshair's Avatar


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    It can be fairly subtle, but if you're printing fine detail, little halftones, 6pt type, etc it's a big deal.
    Crosshair pushing here until its limit the bringing together.

    www.crosshairchicago.com

    "Every single Crosshair poster I've ever seen is almost exactly the same. Do these guys even have a bit of creativity in them? I mean, come one - shitty old building pics photoshopped with text over them. Pretty pathetic to say the least."

    "it just seems like so little effort is put into creating this? am i missing something?"

  7. #7
    Premium Member
    Steph Nitro's Avatar

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    i tend to take the diagonal of a screen as a rough guide. except for tiny t-shirt screens that i have at a more or less constant 4 feet.

  8. #8
    IVARTON's Avatar

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    Default

    Oh and I have 4 500 watt halogen lights. Yes I know that seems like a lot, but they were free and i was all like..... Im not gonna do anything else with them so screw it.

  9. #9
    Premium Member
    swampviking's Avatar


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    I would stick to your old measurement Ravi - two flaming latex fists away from the screen.

  10. #10
    ImJustRickG's Avatar

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    Default

    Wow... I use 2 and my glass gets all hot and starts to worry me.

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