Re: [Frameworks] orwo un54/n74 dev as Negative
Rodinol is always going to give much much grainier results than a fine-grain developer like D-76 or a developer with a silver solvent like Microdol-X. But, Rodinol is also going to give you much better separation in highlights. It's not very compensating, but it will stretch the head of the curve enough that you'll see some compensation and highlights won't block up as easily as they would with a D-76. You could try adding additional sulfite to Rodinol to reduce grain at the expense of film speed; the sulfite will act as a silver solvent and feather the edges of the grains so they aren't as well-defined. Microdol-X uses thiocyanate for that, but thiocyanate is very touchy about concentration and finding the precise amount you want will be difficult, whereas adding sulfite will have much less dramatic effects. --scott ___ FrameWorks mailing list FrameWorks@jonasmekasfilms.com https://mailman-mail5.webfaction.com/listinfo/frameworks
Re: [Frameworks] orwo un54/n74 dev as Negative
In a Lomo tank I've done UN54 as negative with the Adox Rodinal remake in a 1:50 dilution for 10 min development time at 20c. I got this time from the massive development chart. For the same formula and temp the massive dev chart says 13' for UN74 at 400 ISO. Not sure if Rodinal would be ideal for the faster emulsion. Hope this helps! Chris > On Mar 5, 2017, at 12:45, franco base wrote: > > Hi, > have you got some experience to share > with orwo un54 and n74 film developed as negative? > > I'd like know the developer and times also for pull and push processing, > particularly for the n74 exposed at 800/1600 asa. > > Thanks a lot. > F. > ___ FrameWorks mailing list FrameWorks@jonasmekasfilms.com https://mailman-mail5.webfaction.com/listinfo/frameworks
Re: [Frameworks] orwo un54/n74 dev as Negative
I cannot speak about un54. I have run n74 in roller-transport machines and found that it took slightly less time, maybe 10% less, to get a gamma of .65, compared with Tri-X, using a conventional D-96 developer. If I were hand-processing, I would start out with the Tri-X times and work my way up or down from there. But I would expect to be going slightly down. n74 seems very much like a copy of Tri-X from the early 1970s before the major film stock changes in 1976 came about. Just like old Tri-X, it had amazing blacks, very solid, but did not push very well at all. It tended to come apart with very coarse grain and block up very easily. I suggest that if you are trying to push-process n74 that you might want to consider trying Acufine, which worked very well on the old Tri-X RP 7207 way back when. Note that both n74 and un54 are also sold as still photography films, and as such the still version data sheets should have time and temperature charts on them. These are likely to work pretty closely for large reel development. If you're going reel and trough or rewind tank processing, all bets are off. --scott ___ FrameWorks mailing list FrameWorks@jonasmekasfilms.com https://mailman-mail5.webfaction.com/listinfo/frameworks
