suse Posted December 6, 2006 Share #1 Posted December 6, 2006 Advertisement (gone after registration) Hi I'm about to try my first batch of Ilford Perceptol with HP5 400. But I'm having real trouble, for some reason, understanding their time-temperature correction graph. All the times given on the inside of the pack are for 20 degrees...and the compensation graph might as well have been written in Chinese for me. Does anyone know what HP5 at 24 degrees would be? I can't find anywhere on the net that mentions it either, so any pointers would be great! Sue Link to post Share on other sites More sharing options...
Advertisement Posted December 6, 2006 Posted December 6, 2006 Hi suse, Take a look here Perceptol developer and temps. I'm sure you'll find what you were looking for!
rob_x2004 Posted December 6, 2006 Share #2 Posted December 6, 2006 Unless there is something really curly odd about perceptol, then straight off the published data, eleven minutes stock solution at 20C taken up to 24C is a bit over seven minutes. Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! There are other places, but you can find all this here, The Massive Dev Chart: B/W Film Development Times, Processing Data with stock, 1+1, 1+2, 1+3. Kind of seems pretty robust and tolerant. You might want to do strips some time depending on the effect you are looking for. Once you are down to seven minutes though, you probably want to use 1+1 so that your pour out time isnt quite so critical, and which is something like 15min/20C or 10:45/24C Apologies if you way are past this and I have missed something. Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! There are other places, but you can find all this here, The Massive Dev Chart: B/W Film Development Times, Processing Data with stock, 1+1, 1+2, 1+3. Kind of seems pretty robust and tolerant. You might want to do strips some time depending on the effect you are looking for. Once you are down to seven minutes though, you probably want to use 1+1 so that your pour out time isnt quite so critical, and which is something like 15min/20C or 10:45/24C Apologies if you way are past this and I have missed something. ' data-webShareUrl='https://www.l-camera-forum.com/topic/10821-perceptol-developer-and-temps/?do=findComment&comment=112611'>More sharing options...
suse Posted December 6, 2006 Author Share #3 Posted December 6, 2006 Hi Rob No, that's wonderful, thanks a million Rob. Just for educational purposes - how are you reading the graph? I can't see how to start approaching the diagonal lines (and where have the red dots come from!?) ??? Link to post Share on other sites More sharing options...
rob_x2004 Posted December 6, 2006 Share #4 Posted December 6, 2006 Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! For 1+1 start at 15minutes @ 20C, take a line up to 24C, and the new temp is somewhere close to 11minutes. Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! For 1+1 start at 15minutes @ 20C, take a line up to 24C, and the new temp is somewhere close to 11minutes. ' data-webShareUrl='https://www.l-camera-forum.com/topic/10821-perceptol-developer-and-temps/?do=findComment&comment=112627'>More sharing options...
leicamann Posted December 7, 2006 Share #5 Posted December 7, 2006 Rob I use mostly Rodinol and Ilfotec and Ilfosol..all with excellent results. Now why use Perceptol ? Is it any better? Thanks Regards, Leicamann Link to post Share on other sites More sharing options...
rob_x2004 Posted December 7, 2006 Share #6 Posted December 7, 2006 I dont know I have never used it. After a year on ID11 I went back to Rodinal. The only problem I can see with Rodinal is that it is now in a translucent bottle and the lable is red instead of orange. You just cant have it all can you. ..... Link to post Share on other sites More sharing options...
wide.angle Posted December 7, 2006 Share #7 Posted December 7, 2006 Advertisement (gone after registration) Once you are down to seven minutes though, you probably want to use 1+1 so that your pour out time isnt quite so critical, and which is something like 15min/20C or 10:45/24C Rob, great tip, hadn't thought of that. Link to post Share on other sites More sharing options...
haris Posted December 8, 2006 Share #8 Posted December 8, 2006 http://www.ilfordphoto.com/Webfiles/200621612182416.pdf Link to post Share on other sites More sharing options...
haris Posted December 8, 2006 Share #9 Posted December 8, 2006 That is, I would stay at 20 degrees celsious and would not experiment with 24 degrees. So, 20 degrees, 18 minutes, dilution 1:1. Link to post Share on other sites More sharing options...
Michael-IIIf Posted December 8, 2006 Share #10 Posted December 8, 2006 I would stay at 20 degrees celsious and would not experiment with 24. Sue, that would be my thinking as well. Best to use 20c - unless you are in the tropics with no access to electricity. Michael Link to post Share on other sites More sharing options...
fotohuis Posted December 8, 2006 Share #11 Posted December 8, 2006 Perceptol is going to react in another way on higher temperatures. By the way it's an ultra fine grain developer but you will loose sharpness (acutance) and film speed. Use HP5+ on E.I. (iso) 250. If you want to develop on higher temps it's better to use another ultra fine grain developer like CG512 (also sold under Rollei Low Speed) on 24 degrees C. It's a reference developer designed by Uddo Raffay (512 attempt to complete the test, that's why the name) and this ultra fine grain developer will produce more sharpness than Perceptol. You will also have a loss of film speed with the HP5+ : E.I. 200. (13,5 Min.) Here is the dev. table for CG512 (all temperatures on 24 degrees C.). http://www.fotohuisrovo.nl/documentatie/CG-512%20ontwikkeltabel.pdf Best regards, Robert Link to post Share on other sites More sharing options...
nemeng Posted December 8, 2006 Share #12 Posted December 8, 2006 BTW the development times / performance / characteristics of Ilford Perceptol are the same as for Kodak Microdol-X. So search google for Microdol-X and you are set :?) Also, here's another vote for using these developers in 1+1 dilution form. You don't lose any ISO speed and the results are still v.fine grain. Link to post Share on other sites More sharing options...
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