StS Posted June 12, 2011 Share #1 Posted June 12, 2011 Advertisement (gone after registration) Developing two films (Tmax400, pushed to 1600), I found my bathroom to be at 24°C (summertime). I simply corrected the time according to the data sheet and was a bit disappointed by the dynamic range of the results, I had good experiences pushing Tmax400 to 1600 in the past. Maybe I did Tmax3200 bad justice, I developed two rolls at 24°C as well and was disappointed by the poor dynamic range. Since the motifs are not the same, it stays a speculation, however, I guess it is better to develop at 20 or 21°C in the future. Cheers Stefan Link to post Share on other sites More sharing options...
Advertisement Posted June 12, 2011 Posted June 12, 2011 Hi StS, Take a look here It appears I lose dynamic range at 24°C. I'm sure you'll find what you were looking for!
adan Posted June 13, 2011 Share #2 Posted June 13, 2011 Yep - some films (like Ilford's Delta 3200) even come with separate specific tables for 25° development, which give different times than one would get just converting from the 20° times. Most analog thermometers, except really expensive lab-grade mercuries, are calibrated to one temperature (68°F/20°C for "photo" thermometers) and drift a bit at higher or lower temps. Link to post Share on other sites More sharing options...
aesop Posted June 13, 2011 Share #3 Posted June 13, 2011 Yep - some films (like Ilford's Delta 3200) even come with separate specific tables for 25° development, which give different times than one would get just converting from the 20° times. Most analog thermometers, except really expensive lab-grade mercuries, are calibrated to one temperature (68°F/20°C for "photo" thermometers) and drift a bit at higher or lower temps. ...correct me if I'm wrong, Andy, but I think Stefan's specific point is that the dynamic range of TMax400 gets "compressed" once development is carried out in temperatures above a certain threshold (24º?). Nothing to do with recommended temperatures or extended times, just that once you develop film X above a certain temperature, you lose some of the dynamic range. This is my understanding - Stefan, perhaps you could clarify. Link to post Share on other sites More sharing options...
StS Posted June 13, 2011 Author Share #4 Posted June 13, 2011 The issue is that I appear to lose details in the highlights as well as in the dark parts of the image. If I would have over-developed by a mistake in adapting the development time or measuring the temperature, I should have mainly gotten too dense negatives, in my understanding. I simply would have liked understand what happened, but of course, this is nothing, which can be resolved by remote diagnostics. Nothing dramatic, the negatives are usable, if below expectation. I'm simply ranting a bit... Cheers Stefan Link to post Share on other sites More sharing options...
adan Posted June 14, 2011 Share #5 Posted June 14, 2011 Well, the TMax films (at least 100/400) tend to get compressed highlights if one just looks at them crosseyed. That's always been the knock against them. They are wonderful if processing is exactly right - but are intolerant of any variation. It's why Tri-X and Plus-X still exist. Link to post Share on other sites More sharing options...
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