Response to HP-5+ in Rodinal

Ed...jim here...I'm the guy that asked the Delta 3200 question that prompted you to construct the _GREAT_ Delta 3200 chart on your site. Anyhow several years ago I received a paper from Agfa detailing the use of Rodinal at 1+25, 1+50 and 1+100 dilutions...it is somewhat out of date as some film emulsions have changed but I know that it works great for TriX. The paper suggests a standard time of 20 minutes for all 1+100 and 15 minutes for all 1+50 dilutions. What changes is the EI you shoot the film at and the contrast index the neg produces...(I'm not sure what this contrast index means, perhaps you could explain?). So here goes...all the following for 35mm or 120 at 20 C or 68 F with constant aggitation for the first minute and then 5 seconds every additional 30 seconds...which for me works as 20 gentle complete inversions in the first minute and one gentle complete inversion for each remaining 30 secondsyou would shoot HP5+ at EI 160 for Rodinal at 1+100 (20 minutes)...Agfa does not recomend HP5+ at 1+50 and they rated HP5+ at 320 in 1+25 Rodinal for 8 minutes...Now TriX was another story...TriX is rated at EI 400 for 1+100 (20 minutes)or EI 250 at 1+50 (15 minutes) and it looks _great_ although I prefer Agfa APX 400 at EI 250 for 1+100 (20 minutes)...I will have to check the sheet for Delta 400 as I do not remember if there was a time for it (it may not have been released when the sheet was written)...I will also check for Verichrome Pan...email me if you have any questions or if you want me to fax the sheet...thanks for all your help in the past...jim

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