I am trying to get this film dialed in and the results are not making sense, I get an EI of 22 for JandC 400.....what gives? Could it be a mistaken film? I hope not I ordered 8x10 and 12x20.....
I am trying to get this film dialed in and the results are not making sense, I get an EI of 22 for JandC 400.....what gives? Could it be a mistaken film? I hope not I ordered 8x10 and 12x20.....
Here at work I have only my Palm and ExpoDev, but putting in some figures I get an EFS of 431 with an SBR 7 negative (low EV9 and high EV11) and 1/4 sec at f/32. I did my tests with Pyrocat P, which is supposed to have essentially the same times as HD. Paper ES for my tests was 1.2, so YMMV.
juan
Last edited by j.e.simmons; 12-Oct-2006 at 05:55.
Jorge,
I have same issues with JandC Pro 100. I am getting EI6 on that one.
Jorge, I had a similar experience with Efke PL 100 several months ago. John replaced the film and it resolved the problem. I think the factory screws up sometimes.
I think that's why John at JandC now promises that the Adox branded film will be tested before leaving Europe.
juan
Just to eliminate the silly stuff -- that sounds awfully similar to results I read about a photography student getting some years ago when testing Tri-X (the ISO 320 sheet version): EI 16. What eventually turned out to be the case was that he was loading it backward in the holders, and exposing through the antihalation layer resulted in loss of about 4.5 stops of speed.
Now, I presume, Jorge, that you aren't making that mistake (especially not with enough sheets to get completely through a test series) -- but I can easily see how a batch of film could have gotten notched on the wrong corner, i.e. upside down when the notches were cut. Shouldn't be terribly hard to check to be sure the emulsion is on the correct side on some of the developed negatives (which wouldn't even require sacrificing a sheet to look for the light and dark sides)...
If a contact print at arm's length is too small to see, you need a bigger camera. :D
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