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  1. #1
    mryoda's Avatar
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    Changing Paper Size

    Hey!
    Currently i am printing on Ilford Multigrade 5x7 and i want to make a bigger
    print using Ilford Multigrade 8x10
    Will i need in increase exposure times for the bigger paper or will it stay the same ?
    Is there anything else to know ?
    Thanks!
    When your dead, None of this Matters.
    Film- Nikon F65, Sigma 28-80mm Macro Lens, Canon EOS 50E with Canon 28 - 80mm Lens
    Yashica-A (my new fav)

  2. #2
    PDH
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    In most cases es, increasing magification requires addtional time. But in some cases one brand of paper may be faster so changing from 5X7 to 8X10 may take more or less exposure. My quess you will need to increase your times.

  3. #3
    Nicholas Lindan's Avatar
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    Big long thread here:

    http://www.apug.org/forums/forum41/5...djustment.html

    Time multiplier = ((New Magnification + 1) / (Old Magnification + 1)) ^ 2

    For 35mm going from 5x7 to 8x10, as close to full frame as you can get and with 0.25" margins:

    Old magnification = 4.76
    New magnification = 7.94
    Time multiplier = 2.4
    DARKROOM AUTOMATION
    f-Stop Timers - Enlarging Meters
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  4. #4

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    It takes about double the exposure. You can either double the exposure time or open up the lens one stop.

    You may need to fine tune it a little. When size of images change, the way they look, perception wise, change. I often end up needing more contrast and little more exposure than what calculation tells me. I go between 8x10 and 11x14 all the time.
    Develop, stop, fix.... wait.... where's my film?

  5. #5
    mryoda's Avatar
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    This sounds interesting, another step on the learning curve.
    I am looking forward to this
    Thanks to you all, i will get reading that thread...
    When your dead, None of this Matters.
    Film- Nikon F65, Sigma 28-80mm Macro Lens, Canon EOS 50E with Canon 28 - 80mm Lens
    Yashica-A (my new fav)

  6. #6
    Kevin Kehler's Avatar
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    Save yourself the headache - make new test strips and a new print. Not only can you discover a better print but trying to do the math often leaves to a disappointing print. You're more likely to throw away more paper from disappointing prints than the cost of a series of test strips.
    Once a photographer is convinced that the camera can lie and that, strictly speaking, the vast majority of photographs are "camera lies," inasmuch as they tell only part of a story or tell it in a distorted form, half the battle is won. Once he has conceded that photography is not a "naturalistic" medium of rendition and that striving for "naturalism" in a photograph is futile, he can turn his attention to using a camera to make more effective pictures.

    Andreas Feininger

  7. #7
    mryoda's Avatar
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    In truth, i would have always done a test print, but
    I wanted to get in the ball park and would have never guessed that
    1 size up in paper was more than 2x the exposure time or at least 1 f/stop
    It was exactly the fear of wasting paper that led me to the question,
    10x8 is twice the price of 5x7
    When your dead, None of this Matters.
    Film- Nikon F65, Sigma 28-80mm Macro Lens, Canon EOS 50E with Canon 28 - 80mm Lens
    Yashica-A (my new fav)

  8. #8
    Nicholas Lindan's Avatar
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    Quote Originally Posted by mryoda View Post
    10x8 is twice the price of 5x7
    See, that's why it needs twice the exposure...
    DARKROOM AUTOMATION
    f-Stop Timers - Enlarging Meters
    http://www.darkroomautomation.com/da-main.htm

  9. #9
    mryoda's Avatar
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    lol i wonder if it works out like that, all the way
    up the paper scale
    When your dead, None of this Matters.
    Film- Nikon F65, Sigma 28-80mm Macro Lens, Canon EOS 50E with Canon 28 - 80mm Lens
    Yashica-A (my new fav)

  10. #10

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    Here's an easy way to figure it out.

    Take the standard size.... 5x7, 8x10, 11x14, and 16x20
    When you go up a size, it's about twice as much surface area. It's not exact because the aspect ratio is little different and thus your cropping won't be the same. In addition, as I said earlier, your eyes will interpret contrast and density differently.

    Nevertheless, giving twice as much exposure as you go up a size either by doubling your time or opening the aperture one stop will get you in the ballpark.

    Obviously, if you go up two sizes, then you have to double the double so you'll be quadrupling the time, or opening two stops. (oh, yeah.... and you pay 4 times as much)
    Last edited by tkamiya; 07-13-2012 at 08:04 PM. Click to view previous post history.
    Develop, stop, fix.... wait.... where's my film?

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