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Thread: Pinhole macro (does this count as a "Lens" question?!)

  1. #11

    Join Date
    Oct 2015
    Posts
    19

    Re: Pinhole macro (does this count as a "Lens" question?!)

    Hi all,

    Thanks very much for your replies--a lot to think about . I've seen some information that talks about optimising pinholes for a particular focal length and also some different information that talks about optimising pinholes for the pinhole-to-subject distance, which is why I was asking real people with real experience if it is possible, or rather perhaps scientifically meaningful, to optimise a pinhole for a particular distance (either as a stand-alone question or in addition to being optimised for a focal length). Light will of course be an issue, but my plan is to bring along a sketch pad and pencils, or a good book, or some music to practice, to pass the time during hour-long exposures .

    In the meantime, thank you for links to websites and calculators, and I have a plan brewing to see if I can do some experimentation digitally.

    Thanks again,
    Sharon

  2. #12

    Join Date
    Aug 2013
    Location
    Chicago
    Posts
    1,428

    Re: Pinhole macro (does this count as a "Lens" question?!)

    You might find this site more useful:
    http://www.f295.org/main/forum.php

  3. #13

    Join Date
    Oct 2015
    Posts
    19

    Re: Pinhole macro (does this count as a "Lens" question?!)

    Hi again all,

    Thanks again for your suggestions and pointing me toward some very useful links. I've surprised myself with some success! I bought a set of pinholes from pinholeresource.com and mounted a couple of them on lensboards, then used them with our 4x5 Arca. I tried two setups, one at a focal length of about 200mm and one at about 400mm. In bright sunlight (through the window) I got reasonable exposure times (5-30 min, though as you can see, if I've attached the files correctly, I still had some under-exposure with one setup). Particularly with the 400mm focal length, I was getting good magnification of around 5x--not pin-sharp, of course, but I'm really interested in being able to see detail (which I can) rather than maximising sharpness.

    Click image for larger version. 

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    I'm keen to try getting closer in with the 400mm focal length, but I'm finding that as I move it closer to the subject, the large camera throws a lot of shadow on the subject, pushing the exposure times to the ridiculous. We have some ideas about how to combat this--namely, constructing a tapered camera (we're thinking of adapting a traffic cone, for starters ) and learning how to use a flash.

    Anyway, thanks again--I'm pleasantly surprised that I seem to be getting somewhere! If anyone is interested in updates, let me know and I can keep posting .

    Best wishes,
    Sharon

  4. #14
    Randy Moe's Avatar
    Join Date
    Dec 2011
    Posts
    8,249

    Re: Pinhole macro (does this count as a "Lens" question?!)

    Cool keep posting results!

    Your posts sent me to strange pinhole lands. Such as Electron Microscopes that use Pinhole, LF film and Gas Burst Development.

  5. #15

    Join Date
    Oct 2012
    Location
    Portland, OR
    Posts
    585

    Re: Pinhole macro (does this count as a "Lens" question?!)

    Yes keep updating!
    ~nicholas
    lifeofstawa
    stawastawa at gmail

  6. #16

    Join Date
    Oct 2015
    Posts
    19

    Re: Pinhole macro (does this count as a "Lens" question?!)

    Well, I've built myself a camera out of our old Arca 4x5 rear standard and a traffic cone...photos attached. I'm getting upwards of 20x magnification with good detail, I think (using FP4 and a flash).

    Click image for larger version. 

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    Next steps are getting rid of internal reflection in the camera and seeing how far back I can move it from my subject while still getting good detail (because the fewer times I need to change the pinhole size, probably the better). Also probably moving to HP5 rather than FP4 so I don't need quite so many passes with the flash, but we'll see...

    Thanks for your interest !

    Sharon

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