Just a short post to clarify, since some have obviously misunderstood what I was trying to say:
Originally Posted by ic-racer
I use the Zone System. I calibrated the new Tri-X (320TX) with PMK when the film was first introduced and arrived at personal E.I.s and development schemes for N-4 through N+2.
Lately, negatives developed my "N" time, which was doing just fine, seem to be underdeveloped. I have increased my development times some (ad hoc) to compensate, but need to recalibrate. It does indeed seem at first glance that the latest batches of film I have used need more development than earlier ones of the same film (all 320TX).
So, to rephrase my question: Has anyone else arrived at a "Normal" development scheme some time ago and that worked just fine then found their recent Tri-X negatives to be underdeveloped according to what they calibrated for?
If so, this would support the OPs observations (and mine) and indicate a possible change in the way the film responds. It could be manufacturing inconsistency or, more likely, a reformulation that requires more development now.
I'm interested in hearing, since there are many other factors that could affect development. Maybe it is just that my last batch of PMK is not as active as what I used in the past (again, possible manufacturing inconsistency or mixing error or...)
There, I hope that's clear now.
Last edited by Doremus Scudder; 03-24-2012 at 05:33 AM. Click to view previous post history.