j. white Posted January 3, 2008 Share #1 Posted January 3, 2008 Advertisement (gone after registration) Let's start of thread for those using rotary processors for film. I'll start with a suggestion and a question: I have used a combination of Tri-X developed in Rodinal using a rotary processor (a jobo) for several years. After extensive testing and experience, I have come to understand this combination very well. My recipe: For rolls with general contrast, shoot at iso 200 and develop in Rodinal at 1:49, using 150ml per 36 exposure roll, for 7.5 minutes at 70 degrees. This works very well for use with a condenser enlarger and with the lab I use for scans. I love the look, but have just shot a number of rolls that would benefit from using a developer with lower acutance and the attendant grain - I'm thinking either HC-100 or D-76. Can anyone suggestion a starting point for a dilution, developer amount, time, and temperture? Many thanks for your help. -J. Quote Link to post Share on other sites More sharing options...
Advertisement Posted January 3, 2008 Posted January 3, 2008 Hi j. white, Take a look here Rotary Processing Recipes. I'm sure you'll find what you were looking for!
tobey bilek Posted January 4, 2008 Share #2 Posted January 4, 2008 D76 1:1 for 9.5 min at 68. Take 15% off for rotary processing ending up with 8 min. You need 4 oz each D76 and water. Divide 8 by 1.4 to get a time for stock D76. If you wish to use EI of 200, use 80% of above times Quote Link to post Share on other sites More sharing options...
andybarton Posted January 4, 2008 Share #3 Posted January 4, 2008 I am looking forward to experimenting with some Astia and a Jobo and will "blog" my findings here when the chemicals arrive. Keep up the good advice! Quote Link to post Share on other sites More sharing options...
stunsworth Posted January 4, 2008 Share #4 Posted January 4, 2008 Hi Andy, I'm sure you'll be blown away when you take that first roll of Astia off the spool and see the results in glorious colour. Regarding Tri-X, I had lots of success (at least in my terms) using Xtol diluted 1:3 in a normal tank. Because there's even less active developer in a Jobo than a normal inversion tank you might want to drop that dilution to 1:2 or 1:1. Quote Link to post Share on other sites More sharing options...
j. white Posted January 4, 2008 Author Share #5 Posted January 4, 2008 Looking back on my processing notes, here's another recommendation (using Jobo tanks): Film: T-Max 100 ISO: 50 Developer: HC-110 Dilution D (1:9) Quantity: 150ml per roll (in a small [2521] tank) Temp: 70 degrees Pre-Soak Time: 5:00 Development Time: 6:35 Again, this is for use with a condenser enlarger. I've also had good experience with using John Sexton's advise for increasing development times by 20% for use with diffusion enlargers. Additionally he has stated that he doesn't like the look of the T-Max films using this developer and I agree the negs have perhaps a bit more grain than is optimal for this film. Quote Link to post Share on other sites More sharing options...
j. white Posted January 13, 2008 Author Share #6 Posted January 13, 2008 D76 1:1 for 9.5 min at 68. Take 15% off for rotary processing ending up with 8 min. You need 4 oz each D76 and water. Divide 8 by 1.4 to get a time for stock D76. If you wish to use EI of 200, use 80% of above times Thanks so much, Tobey. After processing more than a dozen rolls, I've found that my ideal starting times for this combo are: Film: Tri-X (400 TX) ISO: 200 Developer: D-76 (1:1) Quantity: 215ml per 36 exposure roll (in a large [2553] tank) Temp: 70 degrees Pre-Soak Time: 5:00 Development Time: 6:00 Quote Link to post Share on other sites More sharing options...
rolfe_tessem Posted January 13, 2008 Share #7 Posted January 13, 2008 Advertisement (gone after registration) If you add a five minute water pre-wet, you can use the times published for inversion processing with any developer. Just be sure that, because of the small quantities of developer in a Jobo, you don't use less developer concentrate per roll than the manufacturer recommends. This is usually only an issue with extreme dilutions. Quote Link to post Share on other sites More sharing options...
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