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Thread: Human sized camera

  1. #31
    Tin Can's Avatar
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    Re: Human sized camera

    Tin Can

  2. #32
    Tin Can's Avatar
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    Re: Human sized camera

    I want to try a trailer cam

    Just bought two 36 mm diameter 4000 mm positive meniscus coated, part # L14816 from surplus shed for $16 delivered

    The trailer is 14' straight and 17' with nose

    I am in it every day, already made dark slides for the 2 windows

    no time to waste

    Great thread!
    Tin Can

  3. #33

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    Re: Human sized camera

    I am also interested in this human sized camera. I have a 48" (1219mm) lens, a 20x24" contact frame and a box of 20x24 photo paper. I need find a big camera box/tent and a print drum.

  4. #34
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    Re: Human sized camera

    When I do big enlargements I test center and corners with 5X7 RC paper
    Tin Can

  5. #35

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    Talking Re: Human sized camera

    Hi all,

    Much has happened since then but the project is still in progress !

    Here is an update of it :


    PAST :

    - I made a wooden pinhole camera to test the Harman Positive Paper. I lost the results in a move between houses.
    - I bought a Rodenstock APO-Ronar 1070mm F/14 from someone living 1 hour away from me. I was able to see the beast for real before buying, so lucky !
    - For a long time I stored it because there wasn't any mount on it so I couldn't put it on a tripod.
    - I began to work with cows, and then horses too. Not ready to guide a pair of it however.


    PRESENT :

    - Recently I made a custom piece so I can screw a quick release plate on it. See pics below. That took me so long but it’s done and I'm so happy to be able to put my lens on a tripod.
    - I finally made some first camera obscura tests. Here are the first results so far.
    - Day 1, my girlfriend and I were so amazed and this was all about excitement and opening a new world of creative possibilities !
    - Day 2, I was wondering about the minimal distance of focus. I put the lens instead of my front door, put a drying rack right in front of it and hung a tea cup on it. The object had to be small and shiny so I could see it easily and still see the background behind it. The wind kept making it sway, so that was nice to watch ! The farest wall from the lens is 7,3m away. To have the cup in focus, I had to put it 1,25m away from the lens. It was so huge, yet the quality was wow !
    After that I decided to play with depth of field. I got back into our bedroom and tried to close the diaphragm to see the DOF changing. Then I tilt the focal plan (a piece of plywood for now) here and there to see changes. I did a Scheimpflung attempt so the tree line in the background was sharp. And an anti-Scheimpflug to make only the electric post in focus. The setup is still installed, amazing to see the cloud come and go.


    FUTURE :

    - I want to redo some tests with the direct photo paper from harman. I know that it is selling a 1,27mx15,0m roll of it so I know I would be able to scale up if I’m going with that solution.
    - I'm still looking for a color solution though. Look at that blue sky and those yellowish fields !
    - I will transform my van into a camera. I suppose it will be a first step toward a solution powered by real horses ! I want to make a system in my van to slide, rotate and tilt a plane on which I’ll magnetize the photo paper. My idea is to put the lens in the back of the van. Maybe be able to process the pictures in there too...


    QUESTIONS :
    - Is there a linear relation between distance from lens to object and from lens to focus plane ? Today my object was placed 1,25m from the lens and the focus was 7,3m behind the lens. Can I use that ratio to calculate future space needed for another object. Would be super practical to know where to position myself on the field !

    - I’ll probably need a shutter, even if exposure time might be pretty long most of the time, so maybe you know a hack to DIY that ? 3D print ?

    PICTURES :

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  6. #36

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    Lightbulb Re: Human sized camera

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  7. #37
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    Re: Human sized camera

    1/p + 1/q = 1/f

  8. #38

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    Re: Human sized camera

    Quote Originally Posted by ic-racer View Post
    1/p + 1/q = 1/f
    Thank you for pointing it out. I had a bit of a hard time to understood it but I have finally got it. I made a template on a Google Sheet so I'll just have to input the distance of my subject to get an idea of the space I need behind the lens. I suppose it will be useful at first.
    In my van I would be able to shoot as close as roughly 2.3m. Pretty nice portraits to come !

  9. #39
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    Re: Human sized camera

    I wasn't sure if you had encountered the equation before, the 'thin lens equation'

    http://hyperphysics.phy-astr.gsu.edu...pt/lenseq.html

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