stormbytes
Member
A few days ago I decided to run some tests on Tri-X (txp 320) in Rodinal. Naturally, my first stop was Apug.org to see what fellow Apug'rs had to report on the subject. In one such thread, I came across a reference to a thread on rangefinderforum.com which particularly caught my eye. I'd post a link to the thread, but their site seems to be down at the moment. The author of the thread posted a photograph (a portrait), claiming that it was shot with Tri-X, exposed at ISO 12,800 (a FIVE STOP PUSH!) and processed as follows:
Rodinal 1:50 - manual tank
51 min / 70 F
Agitated for 30 sec - first min, and then 10 sec (5 inversions) every 5 mins
The photograph was truly delightful. Despite being a bit low on the shadow detail, which is to be expected when pushing film, it was dramatic, very sharp and had that Rodinal "textured & defined lines" look to it.
I was hooked. The prospect of being able to shoot hand-held in 75%+ of situations and obtain great results was more then I was willing to pass up. I pulled out a fresh pro-pack of Tri-X 320 (TXP/120) and went off to shoot some test rolls. Here's the data from my tests:
Setting/Subect:
Portraiture, white fair-skinned female, blond hair. Diffuse outdoor lighting
Exposure:
(3) rolls of Tri-X 320 (TXP 120) were exposed indentically. On each roll, the first 5 frames were rated at EI 800, 1600, 3200, 6400 and 12,800, followed by a blank frame, and a repeat of the first 5 frames. I did this so that I could cut the rolls in half and develop each separately. I shot using a Bronica SQ-A with a PS-80mm lens and 120 film back. Incident light readings were taken using my Seikonic L-398 (relatively new, bought last year from B&H).
Development:
I've done 2 batches so far, at 30 & 45 minutes each, processed as follows.
Rodinal 1:50 @ 68 F
Agitation - 30 sec first minute, and 10 seconds e5min thereafter.
I used a Pattreson manual tank, and 500ml of solution p/run.
30 sec - Stop Bath
5 min - iLford Rapid Fix
2 min - Hypo
5 min - Wash (running water)
Printing:
Each negative from each of the batches was printed on Agfa VC Fiber (Semi-Matt) using a Saunders VCCE 4550 enlarger, and developed in Kodak Dektol 1:1.
Test Results:
Batch 1 - Deveoped for 30 minutes
Frame EI 12,800: Unprintable. Barely able to make out parts of the subject.
Frame EI 6400: Unprintable. Subject can be made out, but marginally.
Frame EI 3200: Unprintable. Subect can be clearly made out but scene lacks and semblance of contrast.
Frame EI 1600: Printable - though marginally, and only at maximum constrast setting. Results *may* be suitable for some applications, but I can't imagine it being seen as "intentional".
Frame EI 800: Acceptable. Though contrast still isn't exactly where it should be, skin tones are very nice and shadow detail is "adequate".
Batch 2 - Deveoped for 45 minutes
Frames EI 12,800, 6400 and 3200: Unprintable. Same issues as stated above, with only very minor "improvements". Dynamic range in the negatives isstill vastly inadequate.
Frame EI 1600: Acceptably printable, contrast setting #4. This EI may have some promise with extending of development time, and it is certainly worth the effort given the versatility offered by shooting at this speed.
Frame EI 800: Outstanding! Excellent dynamic range, printable at contrast setting #4 and higher. Skin tones and definition are superb. Photo is sharp and punchy. This is a definit keeper.
Conclusions:
In my tests, I find it to be simply IMPOSSIBLE for the author of the thread on rangefinderforum.com to have achieved his stated results using this film/developer combination. The gap between my results and those alledged by the author is so incredibly wide that it simply cannot be attributed to differences in agitation techniques, water hardness or any other random errors.
For the sake of satisfying the nut case in me, I processed an additional roll using Rodinal 1:25 @ 68 F, in-Jobo (constant agitation) for 30 minutes. The resulting frames, though lacking in the accutance gained by semi-stand development, showed comparable negative densities to the those obtained from manual processing. This, imho, effectively eliminates any doubt about further density buildup being made possible by varrying agitation, time or concentration of the developer solution
I posted these results on that very same thread (rangefinderforum.com), stopping short of calling the guy a liar outright. To this, the author replied that he was using Tri-X 400 (TX) and NOT Tri-X 320 (TXP). Also that his processing temperature was 70 F and NOT 68, and that he processed for 51 minutes vs. my 45 minutes.
Though these differences can be significant where there are minor discrepancies in the results obtained by two different people. I simply can't fathom how 6 minutes of added development time (roughly 15%) and a marginally different emulsion would yeild a net difference of 3 F-Stops with beautiful negs!
Would love to hear what Apug'rs have to say on the issue, and if I'm wrong - by all means, I'd love to stand corrected.
Rodinal 1:50 - manual tank
51 min / 70 F
Agitated for 30 sec - first min, and then 10 sec (5 inversions) every 5 mins
The photograph was truly delightful. Despite being a bit low on the shadow detail, which is to be expected when pushing film, it was dramatic, very sharp and had that Rodinal "textured & defined lines" look to it.
I was hooked. The prospect of being able to shoot hand-held in 75%+ of situations and obtain great results was more then I was willing to pass up. I pulled out a fresh pro-pack of Tri-X 320 (TXP/120) and went off to shoot some test rolls. Here's the data from my tests:
Setting/Subect:
Portraiture, white fair-skinned female, blond hair. Diffuse outdoor lighting
Exposure:
(3) rolls of Tri-X 320 (TXP 120) were exposed indentically. On each roll, the first 5 frames were rated at EI 800, 1600, 3200, 6400 and 12,800, followed by a blank frame, and a repeat of the first 5 frames. I did this so that I could cut the rolls in half and develop each separately. I shot using a Bronica SQ-A with a PS-80mm lens and 120 film back. Incident light readings were taken using my Seikonic L-398 (relatively new, bought last year from B&H).
Development:
I've done 2 batches so far, at 30 & 45 minutes each, processed as follows.
Rodinal 1:50 @ 68 F
Agitation - 30 sec first minute, and 10 seconds e5min thereafter.
I used a Pattreson manual tank, and 500ml of solution p/run.
30 sec - Stop Bath
5 min - iLford Rapid Fix
2 min - Hypo
5 min - Wash (running water)
Printing:
Each negative from each of the batches was printed on Agfa VC Fiber (Semi-Matt) using a Saunders VCCE 4550 enlarger, and developed in Kodak Dektol 1:1.
Test Results:
Batch 1 - Deveoped for 30 minutes
Frame EI 12,800: Unprintable. Barely able to make out parts of the subject.
Frame EI 6400: Unprintable. Subject can be made out, but marginally.
Frame EI 3200: Unprintable. Subect can be clearly made out but scene lacks and semblance of contrast.
Frame EI 1600: Printable - though marginally, and only at maximum constrast setting. Results *may* be suitable for some applications, but I can't imagine it being seen as "intentional".
Frame EI 800: Acceptable. Though contrast still isn't exactly where it should be, skin tones are very nice and shadow detail is "adequate".
Batch 2 - Deveoped for 45 minutes
Frames EI 12,800, 6400 and 3200: Unprintable. Same issues as stated above, with only very minor "improvements". Dynamic range in the negatives isstill vastly inadequate.
Frame EI 1600: Acceptably printable, contrast setting #4. This EI may have some promise with extending of development time, and it is certainly worth the effort given the versatility offered by shooting at this speed.
Frame EI 800: Outstanding! Excellent dynamic range, printable at contrast setting #4 and higher. Skin tones and definition are superb. Photo is sharp and punchy. This is a definit keeper.
Conclusions:
In my tests, I find it to be simply IMPOSSIBLE for the author of the thread on rangefinderforum.com to have achieved his stated results using this film/developer combination. The gap between my results and those alledged by the author is so incredibly wide that it simply cannot be attributed to differences in agitation techniques, water hardness or any other random errors.
For the sake of satisfying the nut case in me, I processed an additional roll using Rodinal 1:25 @ 68 F, in-Jobo (constant agitation) for 30 minutes. The resulting frames, though lacking in the accutance gained by semi-stand development, showed comparable negative densities to the those obtained from manual processing. This, imho, effectively eliminates any doubt about further density buildup being made possible by varrying agitation, time or concentration of the developer solution
I posted these results on that very same thread (rangefinderforum.com), stopping short of calling the guy a liar outright. To this, the author replied that he was using Tri-X 400 (TX) and NOT Tri-X 320 (TXP). Also that his processing temperature was 70 F and NOT 68, and that he processed for 51 minutes vs. my 45 minutes.
Though these differences can be significant where there are minor discrepancies in the results obtained by two different people. I simply can't fathom how 6 minutes of added development time (roughly 15%) and a marginally different emulsion would yeild a net difference of 3 F-Stops with beautiful negs!
Would love to hear what Apug'rs have to say on the issue, and if I'm wrong - by all means, I'd love to stand corrected.