|
|
 | | Author | |
|
| | Date | |
|
|
|
|
Phil Davis |
9:15 23 Apr 05 |
|
|
Miles Nelson |
7:12 24 Apr 05 |
|
|
Phil Davis |
7:48 24 Apr 05 |
|
|
Miles Nelson |
8:39 24 Apr 05 |
|
|
Miles Nelson |
4:57 19 Apr 05 |
|
|
Phil Davis |
7:13 19 Apr 05 |
|
|
Miles |
12:25 19 Apr 05 |
|
|
Mike Pry |
17:59 11 Apr 05 |
|
  |
Re: Plus X Aerographic Film Testing |
|
Phil Davis |
19:34 11 Apr 05 |
 |
Michael --
If you can expose Delta 100 (in D-76+1) at EV 3.0 and find the PSP to be 2.4 your system is "calibrated" satisfactorily for ISO 100. Any other film/dev combination whose "ISO triangle" falls on 2.4 when exposed at EV 3.0, is therefore also a 100-speed film—regardless of the manufacturer's ISO rating.
I'm not looking at your numbers as I write this, but let's suppose you test the Aero PlusX at EV 3.0 (in other words assuming that it's a 100-speed material) and the ISO triangle of this test family indicates a speed point of 1.8 instead of 2.4. In other words, it misses your PSP (2.4) by 0.6, or two stops. This doesn't change your PSP; you've established that as a standard for comparison. What it does show is that your test film/dev combination deserves an EFS (Effective Film Speed) of two stops less than 100, or 25.
Assign it that "ISO" rating and shoot some test subjects; I think you'll find that you get good negatives.
|
|
|
|
|
|
|
|
|
Mike Pry |
3:29 12 Apr 05 |
|
