I have discussed the latent image properties of PAN F and PAN F + before.
PAN F+ is NOT unstable and your theory regarding date stamping an 'old' roll is laughable.
We coat each of our films on a regular basis, some monthly, some bi-monthly and some tri-monthly
and one of our film products ( not PAN F+ ) twice per annum, remember 35mm, 120 film and sheet film are all separate coating events. This ensures that we do not hold too many rolls of extremely expensive coated parent roll material in stock, that would be very bad business, it also ensures that we have extremely fresh film leaving the factory. Every coated parent roll is date registered, and when it is finished into cassettes the coated batch has to have the exact same expirey date on it, its all computer controlled, sequentially finished and called TQM ( total quality management ). Whilst waiting to be finished it is stored under controlled conditions. If a scan of the individual bar code on the parent roll that is to be finished is taken and its not sequential with the last roll ( of the same type ) the process control system cannot be initiated.
Please do not get me wrong, I'm not miffed, you are entitled to whatever opinion you hold and I do not doubt for second they are geniunely held, my issue is that I know the massive amount of hard work and systems that have been put in place to ensure the ultimate in quality control and the money we have spent ( and continue to spend ) to ensure 100% customer satisfaction. I know every single week how much 'waste' we have, that is coated product both film and paper that never finds its way into a box due to our no compromise QC systems, its one of our key KPI monitors.
And the secret is, the better your QC from start to finish the lower the waste will actually be.
Simon ILFORD Photo / HARMAN technology LImited :