> what difference in the negative do you see between the 1:1 and the 1:3 dilution(posted 8527 days ago)What's really surprised me about this is that I _don't_ see any really significant difference between 1:1 and 1:3 with HP5+. I think 1:3 negs may have slightly higher acutance and slightly more grain, but otoh since I'm always using different formats I can't even say that for sure.
At any rate, I haven't seen any reason at all to not use 1:3.
My times for HP5+ in D-76H are: 1:1 13'/68F and 1:3 18'15"/68F. I mix it with distilled water and usually dilute it to working strength with distilled water.
In an odd convenience convergence, Delta 100 and TMX develop to very close to the same CI in D-76H 1:3 at the HP5+ time, so I can develop them all together. At the 1:1 dilution they require different times.
The only potential problem I can think of is that the 1:3 dilution may be more sensitive to agitation problems but since I use what appears to be a streak-proof agitation method (half-full tank, inversion) for rollfilm I haven't had any problem with that. I also use continuous rotary agitation for sheetfilm; again, no problems.