Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 68,678   Posts: 1,482,068   Online: 747
      
Page 1 of 2 12 LastLast
Results 1 to 10 of 14
  1. #1

    Join Date
    Mar 2003
    Location
    Greenville, SC
    Shooter
    Large Format
    Posts
    4,813
    Images
    5

    Checking ground glass/film holder tolerances

    Can anyone point me to articles on the web or in print that describe practical techniques for testing ground glass/film plane tolerances. I am aware of an article on the subject that appeared in PhotoTechniques in 1999 but would like to know of any others that may be out there, perhaps in View Camera? or in on-line sites.

    Sandy King

  2. #2

    Join Date
    Nov 2003
    Posts
    5,231
    Images
    9
    There was one in VC, or shutterbug, maybe, that described using a tooth pick and a pencil. Pretty informative and it works well. I remember the techniques but not where the article appeared, sorry.
    Technological society has succeeded in multiplying the opportunities for pleasure, but it has great difficulty in generating joy. Pope Paul VI

    So, I think the "greats" were true to their visions, once their visions no longer sucked. Ralph Barker 12/2004

  3. #3

    Join Date
    Sep 2002
    Shooter
    Multi Format
    Posts
    653
    Sorry, no article, but FWIW this works for me: put a post-it pad inside the film holder and peel away sheets until a ruler lies flush across both it and the edge of the film holder. Then put the pad against the inside of the ground glass and see if the depth is the same. Not a perfect system, but pretty good.

  4. #4

    Join Date
    Mar 2003
    Location
    Greenville, SC
    Shooter
    Large Format
    Posts
    4,813
    Images
    5
    Quote Originally Posted by mark
    There was one in VC, or shutterbug, maybe, that described using a tooth pick and a pencil. Pretty informative and it works well. I remember the techniques but not where the article appeared, sorry.
    Thanks, I believe that is the one in Photo Techniques.

    Sandy

  5. #5
    glbeas's Avatar
    Join Date
    Sep 2002
    Location
    Roswell, Ga. USA
    Shooter
    Multi Format
    Posts
    3,307
    Images
    109
    I've done it using a steel rule from a carpenters square and a caliper with a depth feeler. laid the ruler across the seat area and the caliper against the rule and pushed the feeler down to contact the bed or the glass. It's best to check your filmholder with film in it naturally and careful not to scratch the GG with the feeler. Don't just check one spot but the center and four corners if at all possible.
    Gary Beasley

  6. #6

    Join Date
    Mar 2003
    Location
    Greenville, SC
    Shooter
    Large Format
    Posts
    4,813
    Images
    5
    Quote Originally Posted by glbeas
    I've done it using a steel rule from a carpenters square and a caliper with a depth feeler. laid the ruler across the seat area and the caliper against the rule and pushed the feeler down to contact the bed or the glass. It's best to check your filmholder with film in it naturally and careful not to scratch the GG with the feeler. Don't just check one spot but the center and four corners if at all possible.
    Yes, ANSI specifications state that the T-dimension should be the same everwhere on the septum 1/4" outside of the film retaining lip.


    Sandy

  7. #7
    DrPhil's Avatar
    Join Date
    Dec 2003
    Location
    Indiana
    Shooter
    4x5 Format
    Posts
    169
    Lambrecht and Woodhouse describe the toothpick method in their book "Way Beyond Monochrome"
    Facts are facts; however, perception is reality.

  8. #8

    Join Date
    Feb 2004
    Location
    Lobsta
    Shooter
    Multi Format
    Posts
    566
    Quote Originally Posted by sanking
    Can anyone point me to articles on the web or in print that describe practical techniques for testing ground glass/film plane tolerances. ...
    Sandy,

    It's not clear to me what you're asking. Are you looking for a method to adjust the ground glass to match the film plane of a holder? Or are you asking how to determine what is a realistic tolerance? Or something else?...
    My Verito page

    Anyone can appreciate a fine print. But it takes a real photographer to appreciate a fine negative.

  9. #9

    Join Date
    Mar 2003
    Location
    Greenville, SC
    Shooter
    Large Format
    Posts
    4,813
    Images
    5
    Quote Originally Posted by wfwhitaker
    Sandy,

    It's not clear to me what you're asking. Are you looking for a method to adjust the ground glass to match the film plane of a holder? Or are you asking how to determine what is a realistic tolerance? Or something else?...
    Just looking for references to articles that may have been published on the subject. Don't need the how to or tolerances, just references to what others may have already published on the subject, either in print or on the web.

    Sandy

  10. #10

    Join Date
    Feb 2004
    Location
    Lobsta
    Shooter
    Multi Format
    Posts
    566
    I think that falls under "something else". ;-)

    Good luck!
    My Verito page

    Anyone can appreciate a fine print. But it takes a real photographer to appreciate a fine negative.

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