Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,205   Posts: 1,531,761   Online: 969
      
Page 1 of 2 12 LastLast
Results 1 to 10 of 16
  1. #1
    BetterSense's Avatar
    Join Date
    Aug 2008
    Location
    North Carolina
    Shooter
    35mm
    Posts
    2,862

    Another 4x5 pinhole

    I didn't have any of them fancy film holders, so this one follows the design of my 8x10...the film sits in the back, and the front slides into the back holding the film flat. Reloading is by changing bag, but it should be a lot more convenient with the small size! It's really quite cute.

    I stole CuS's idea of using a shutter out of an old camera. I stole the shutter assembly out of my Jiffy Kodak 620 camera, which has a "T" setting. I just don't know if the shutter blade seals well enough around the pinhole, since you can see an air gap when it is shut. I made my first exposure on the way to work this morning, but I don't know if it's going to work. I made the pinhole pretty small, it's about .35 mm and the focal length is like 60mm

    Apologies for the quality of the image, it was the only one I had at work since it was attached to an email to my friend.

    f/22 and be there.

  2. #2
    bsdunek's Avatar
    Join Date
    Jul 2006
    Location
    Michigan
    Shooter
    Multi Format
    Posts
    1,109
    Images
    194
    If I'm calculating correctly, that's f 171 - not small at all. My home made pinhole for my Mamiya Press comes out to f 207, and the photos aren't very sharp. I'm going to make a new one somewhere between f 250 and f 300.
    That said, try yours before you change anything - it may work fine.
    Bruce

    Moma don't take my Kodachrome away!
    Oops, Kodak just did!


    BruceCSdunekPhotography.zenfolio.com

  3. #3
    CuS
    CuS is offline

    Join Date
    Oct 2007
    Shooter
    35mm
    Posts
    131
    0.35mm pinhole would need about a 77mm focal length - roughly - try it and see.

    I have my 0.3mm pinhole at 50mm but it should be a 57mm instead - i will try that tonight - here are some shots with "Ned", btw (not sure if I shared these yet):

    http://www.flickr.com/photos/colusit...7620033768138/

    Cant wait to see your stuff!

    I guess the smaller the pinhole (to a point), the sharper the image.

    I wonder what the best size is?

  4. #4
    BetterSense's Avatar
    Join Date
    Aug 2008
    Location
    North Carolina
    Shooter
    35mm
    Posts
    2,862
    Well it sure seemed small compared to the .5mm in my 8x10. I had a hard time making one small enough with my typical sewing needles. I heard that acupuncture needles were better but I don't know where to get any.
    f/22 and be there.

  5. #5
    BetterSense's Avatar
    Join Date
    Aug 2008
    Location
    North Carolina
    Shooter
    35mm
    Posts
    2,862
    Awesome; I just came home and developed my two shots. I forgot to mark which was which, though. They were shots of a building and I did one at about 9am for 15 seconds, and then did another one about 11:30am for 5s. They both look similar but one is slightly more dense and contrastier. I have some light leakage around the edges which I think I can fix with felt. I used Arista EDU ultra 200 and developed in D76 1+1 for about 6 minutes
    f/22 and be there.

  6. #6
    CuS
    CuS is offline

    Join Date
    Oct 2007
    Shooter
    35mm
    Posts
    131
    post dem images - i wanna see!

  7. #7
    BetterSense's Avatar
    Join Date
    Aug 2008
    Location
    North Carolina
    Shooter
    35mm
    Posts
    2,862
    Well I left them hanging up to dry. I developed them during lunch.

    I don't have a LF scanner so I will have to make contact prints and scan those tonight
    f/22 and be there.

  8. #8
    BetterSense's Avatar
    Join Date
    Aug 2008
    Location
    North Carolina
    Shooter
    35mm
    Posts
    2,862
    http://i109.photobucket.com/albums/n...nholenserl.jpg

    It works, but I'll have to approach it more seriously. Right now it doesn't seem like it's as sharp as my big camera.
    f/22 and be there.

  9. #9
    DWThomas's Avatar
    Join Date
    Jun 2006
    Location
    SE Pennsylvania
    Shooter
    Multi Format
    Posts
    2,219
    Images
    64
    Looking good. APUG should have a big turnout for WPPD 2010!

    DaveT

  10. #10
    CuS
    CuS is offline

    Join Date
    Oct 2007
    Shooter
    35mm
    Posts
    131

    looks good - and at least you have a nice subject :)

    Quote Originally Posted by BetterSense View Post
    http://i109.photobucket.com/albums/n...nholenserl.jpg

    It works, but I'll have to approach it more seriously. Right now it doesn't seem like it's as sharp as my big camera.
    Mine are a bit blurry too - maybe a mismatch b/t pinhole size and focal length? Since its hard to make a pinhole for a set camera, maybe make a good pinhole and build the camera around it - or buy one of those fancy-dancy laser-cut pinholes - whats the fun in that though?

Page 1 of 2 12 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin