Page 2 of 2 FirstFirst 12
Results 11 to 18 of 18

Thread: Multiple Test Zones on one Sheet

  1. #11
    Greg Davis's Avatar
    Join Date
    Nov 2009
    Location
    Kentucky
    Posts
    538

    Re: Multiple Test Zones on one Sheet

    In grad school I used three spare darkslides and made a hole in each one (located differently) so I could make 6 patches on one sheet. It worked well, and with 1/2 inch holes you could possible get 12 patches in three columns of four holes per column. It like take 8 darkslides to do it though.

  2. #12

    Join Date
    Apr 2011
    Location
    Southern California
    Posts
    52

    Re: Multiple Test Zones on one Sheet

    Quote Originally Posted by Pere Casals View Post
    Sadly art is more difficult to explain
    So true! However, I do have a decent eye for a tech head nerd.

  3. #13

    Join Date
    Dec 2009
    Location
    Pacifica, CA
    Posts
    1,625

    Re: Multiple Test Zones on one Sheet

    I've written a bit on how to test film.

    Here's a PDF free to download:

    http://beefalobill.com/imgs/20150812...dAttention.pdf

    I noticed some URL's are broken since I wrote that so here's some updated links:

    Resource page at Photrio
    https://www.photrio.com/forum/resour...-attention.77/

    Updated URL's
    Recommended: Working idea - Zone System exposure - Time/CI darkroom
    ( https://www.photrio.com/forum/thread...arkroom.84567/ )

    Recommended: Enlarger -----> Sensitometer
    ( https://www.photrio.com/forum/thread...tometer.92518/ )

    Recommended: Great Sensitometer Shootout
    ( https://www.photrio.com/forum/thread...hootout.95837/ )

  4. #14

    Join Date
    Aug 2000
    Location
    California
    Posts
    2,960

    Re: Multiple Test Zones on one Sheet

    Quote Originally Posted by Greg Davis View Post
    In grad school I used three spare darkslides and made a hole in each one (located differently) so I could make 6 patches on one sheet. It worked well, and with 1/2 inch holes you could possible get 12 patches in three columns of four holes per column. It like take 8 darkslides to do it though.
    I did similar and still have the dark slides. It only takes 3 old dark slides to make 6 exposures on a single sheet. each exposure is made to register Zone I at exposures varying by 1/3 stop. one is made at box speed,and the others are at 1/3 stop lower EI's. THe system has worked for me for about 60 years. I redo it with each new batch of film.

  5. #15

    Join Date
    Jul 2016
    Posts
    4,230

    Re: Multiple Test Zones on one Sheet

    Quote Originally Posted by Jim Noel View Post
    I did similar and still have the dark slides. It only takes 3 old dark slides to make 6 exposures on a single sheet.
    Jim, let me add another way. We may also do it with a single regular holder, we may fire the shutter many times, and each time we insert (say) 10mm more the dark slide, so we may make 12 exposures in a single sheet, the last one has the 12 exposures accumulated, the first one has a single exposure, we may provide an exponential exposure series...

    I do that to find right exposures for paper negatives in pinhole, but it also may be used to test film.

  6. #16

    Join Date
    Sep 1998
    Location
    Oregon and Austria
    Posts
    2,320

    Re: Multiple Test Zones on one Sheet

    I guess I'll jump in here with my method, which entails using a filmholder with a darkslide marked in fifths (i.e., so one can make five exposures on one sheet of film by inserting the darkslide one-fifth of the way into the filmholder for subsequent exposures). I simply marked a darkslide with a Sharpie with lines; no drilling holes and ruining a darkslide required.

    If necessary, I first determine a personal E.I. with a film speed test on one or two sheets of film. I don't do this much anymore, since experience has shown that if I just rate the film 2/3-stop slower than box speed and then keep notes any subsequent adjustments will be really small (1/3 stop usually).

    For determining development times for N, and all N- and N+ times, I make Zone Rulers, using two or three sheets of film. My method is described in the attached document (from my field guide).

    What's missing in the instructions is a discussion about finding the right subject for the tests. I like an evenly-lit textured wall (think stucco or smooth plaster). Using a real-life subject along with the camera and lens you use the most takes flare into account automatically and results in more usable (if less scientific) results.

    Keep in mind, that the whole testing procedure is just to get us in the ballpark. Things like flare from uncoated or single-coated lenses in both camera and enlarger can make a significant difference in the low values, not to mention flare from light sources or bright areas in or just out of the image area.

    Really, only consistent note-taking and making small adjustments can hone an exposure/development system. Using step tablets gives nice clear data, but they are often not relevant to what happens in actual taking situations.

    Best,

    Doremus
    Attached Files Attached Files

  7. #17
    おせわに なります! Andrew O'Neill's Avatar
    Join Date
    Sep 2003
    Location
    Coquitlam, BC, Canada, eh!
    Posts
    4,579

    Re: Multiple Test Zones on one Sheet

    I made a Zone Board, as outlined in Gordon Hutchings', The Book of Pyro. It has worked well for me for over twenty years...

  8. #18

    Join Date
    Apr 2000
    Location
    Calgary
    Posts
    307

    Re: Multiple Test Zones on one Sheet

    Re the target for testing: an evenly lit board, wall etc can be created by using an Expo Disc on the camera lens. I use a 67mm disc which I pressed into an 67mm filter ring (discarded filter, glass removed). A second (smaller) Expo disc I hold in front of the exposure meter when taking the reading-which will be Zone V. I can make the required exposures even when it is 30 below outside: just stay indoors and aim camera at window. Make sure lens opening is such that vignetting cannot take place (look through ground glass cut off corner etc).

    As an aside; the smaller Expo Disc I attached with black tape to a step-up ring fitting my enlarger lens, the prism side of the disc facing the negative. This set-up facilitates flashing of the printing paper, negative stays in place during the procedure while lens opening and/or timer are manipulated as needed.

Similar Threads

  1. Replies: 41
    Last Post: 16-Nov-2016, 07:46
  2. Multiple Exposure on the Same Sheet of Film
    By Downformontreal in forum Style & Technique
    Replies: 8
    Last Post: 31-Dec-2009, 13:19
  3. Too many Zones?
    By Pete Andrews in forum Style & Technique
    Replies: 28
    Last Post: 6-Sep-2004, 15:49
  4. Calibration using 10 zones on a single sheet
    By Shilesh Jani in forum Style & Technique
    Replies: 7
    Last Post: 18-Aug-2004, 14:43
  5. Film test with fuji acros sheet film, 100asa
    By David_2912 in forum Darkroom: Film, Processing & Printing
    Replies: 6
    Last Post: 18-Apr-2002, 22:00

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •