I have recently had problems with a streak, or rather a transparent, diffuse thin line (not a scratch) that runs along the length of my Tri-X 400 120 negatives. It is clearly visible against evenly exposed areas of the film (e.g. the sky) and has been present on four out of the last five rolls I shoot (all probably from the same film pack).(posted 9368 days ago)Strangely enough the line is always in the same place (exactly) on the film, slightly off the center of the exposed 2 1/2 x 2 1/2 inch negative and only shows up on exposures 1-6 (12 exposures/film). The effect has been more prounouced on two of the films. It's hardly a drying mark (I use photo flo) and since the line is always in the same place I find it difficult to believe that it is due to uneven development or incorrect agitation, but I am not certain about this (I have read the earlier postings on film streaks). I pre-wet the films and develop in D-76 1+1 for 10.5 min at 20 degrees Celcius and use 500-600 ml developer/film (Paterson super system 4 tanks). Continous agitation (inversion of the tank) first 30-40 s, and for 5 s every half minute for the rest of the time. I have not had any problems with this earlier, but I am relatively new to 120 film. At the moment I suspect the fault is in the manufacture of the film (I have not yet developed film from a different pack). The film expires november 99 (lot nr 840173). Has anyone had a similar problem?
Per Askerlund