Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,570   Posts: 1,545,484   Online: 1234
      
Page 1 of 2 12 LastLast
Results 1 to 10 of 18
  1. #1
    IloveTLRs's Avatar
    Join Date
    May 2007
    Location
    Switzerland
    Shooter
    Multi Format
    Posts
    1,000
    Images
    2

    1st pinhole experience - advice please?

    The other day I ran across this in a store: http://www.hobbymasters.com/index.as...OD&ProdID=2676 for $15 I thought "why not?"

    I used Plus-X and shot on a pretty sunny day yesterday.

    How can I make them sharper? Is there any way to get them wider-angle?

    Thanks in advance
    Last edited by IloveTLRs; 08-15-2009 at 04:59 PM. Click to view previous post history.

  2. #2
    keithwms's Avatar
    Join Date
    Oct 2006
    Location
    Charlottesville, Virginia
    Shooter
    Multi Format
    Posts
    6,079
    Blog Entries
    20
    Images
    129
    There is an optimal effective focal length for each different diameter of pinhole. The optimal focal length will give best sharpness at the wavelength that you feed into the formula.

    This site seems to have some info that may be of use...

    http://www.mrpinhole.com/calcpinh.php
    "Only dead fish follow the stream"

    [APUG Portfolio] [APUG Blog] [Website]

  3. #3
    Christopher Walrath's Avatar
    Join Date
    Dec 2005
    Location
    Milton, DE, USA
    Shooter
    4x5 Format
    Posts
    6,980
    Blog Entries
    29
    Images
    19
    Wirelessly posted (BlackBerry9000/4.6.0.167 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/102 UP.Link/6.3.0.0.0)

    Wider would be to shorten the focal length by moving either the pinhole or the film towards the other. However this will increase your f number thus slightly reducing sharpness a wee bit. Perhaps imperceptibly.
    Thank you.
    CWalrath
    APUG BLIND PRINT EXCHANGE
    DE Darkroom

    "Wubba, wubba, wubba. Bing, bang, bong. Yuck, yuck, yuck and a fiddle-dee-dee." - The Yeti

  4. #4
    DWThomas's Avatar
    Join Date
    Jun 2006
    Location
    SE Pennsylvania
    Shooter
    Multi Format
    Posts
    2,240
    Images
    65
    Sharp is not really a pinhole characteristic, although I suspect you might be able to do a little better. The width, as Chris says, requires reducing the distance from pinhole to film. In your case, it looks as though the pinhole isn't quite centered left to right. There is hard vignetting on the left side, implying the pinhole is too far to the right. I have no idea what the construction of your camera is, maybe you can make some minor adjustments.

    The Worlwide Pinhole Photography Day folks have a resource page with a lot of links that might yield something useful.

    A few years back I had some problems with vignetting in a homemade body cap pinhole assembly. It turned out there was just too thick a stack of stuff clamped together for the diameter of some of the clearance holes. A careful scale diagram to sort it out, followed by a major rework, fixed the problem. Rev. 2

    DaveT

  5. #5

    Join Date
    Feb 2009
    Location
    Oz
    Shooter
    Multi Format
    Posts
    481
    Quote Originally Posted by IloveTLRs View Post

    How can I make them sharper?
    I understand that a soft image is a pinhole characteristic, but that some aficionados sharpen their images digitally in PP.

  6. #6

    Join Date
    Jun 2006
    Shooter
    35mm
    Posts
    797
    Images
    7
    Hello,
    Can you tell me what the focal length of the camera is? The distance from the pinhole to the film? I may have a pinhole that I can send you and it will help with the sharpness of the image. Also check
    www.f295.org
    There you will see the different possibilties of pinhole cameras. There is no reason, unless it is what you want , for the image to be foggy or soft. With the right pinhole and no photoshop the images can be great and very sharp. The problem you are having is that you are being asked to make a pinhole with a needle in the foil given. You can not be expected to make the correct size pinhole for the focal length of the camera. Therefore the image will never be as sharp as it can be.
    Arthur

  7. #7
    2F/2F's Avatar
    Join Date
    Apr 2008
    Location
    Los Angeles, CA
    Shooter
    Multi Format
    Posts
    8,008
    Images
    4
    Quote Originally Posted by Galah View Post
    I understand that a soft image is a pinhole characteristic, but that some aficionados sharpen their images digitally in PP.
    PP? That must mean Piss Poor, because that's what it looks like most of the time when you take a soft image and try to make it sharp with a computer.

    I think the problem is that the camera probably has cheap foil and probably not the best instructions for how to make the hole. (Whaddayawant for 15 bucks? Heh heh.) It could be improved by installing a nicely-drilled pinhole closer to the "optimum" diameter, and by making sure that the camera is absolutely steady during exposure.
    Last edited by 2F/2F; 04-01-2009 at 02:58 AM. Click to view previous post history.
    2F/2F

    "Truth and love are my law and worship. Form and conscience are my manifestation and guide. Nature and peace are my shelter and companions. Order is my attitude. Beauty and perfection are my attack."

    - Rob Tyner (1944 - 1991)

  8. #8
    David William White's Avatar
    Join Date
    Jun 2007
    Location
    Hamilton, Canada
    Shooter
    Multi Format
    Posts
    1,182
    Blog Entries
    1
    Images
    32
    I agree with 2F/2F. Revel in it, your photographs are wonderfully dreamy.

    However, for tongue-in-cheek completeness, I should mention there is one surefire way to improve the sharpness of your toy camera, and that is to put a focusing lens in front of it.

  9. #9

    Join Date
    Oct 2004
    Location
    Stavanger or Trondheim, Norway
    Shooter
    Multi Format
    Posts
    771
    Images
    24
    You can get sharper shots with a better hole (perfectly circular, without burrs etc) placed at the correct distance from the film plane, as 2F/2F said, but pinhole shots will never be perfectly sharp.

    I agree with David William White - enjoy the dreaminess. Maybe make some lith prints to exploit it, or cyanotypes. Use the vignetting pictorially in your composition. Sepia toned prints with the vignetting would have a very old-fashioned look, so make people think by taking modern subjects (as you have done) and giving them that kind of treatment.

    You can have all kinds of fun with it.

    cheers
    Pete

  10. #10
    IloveTLRs's Avatar
    Join Date
    May 2007
    Location
    Switzerland
    Shooter
    Multi Format
    Posts
    1,000
    Images
    2
    I made another pinhole today and will try the camera out again.

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