Hi - For the last forty or so 5 x 4 inch exposures I have been using a Paterson Orbital tank (motorised) with Retro Pyro, developing for approximately 7 minutes depending on temperature. I have noticed on a few negatives, 4 or 5 out of the forty signs of uneven development in sky areas.
On the example attached the streaking is in the sky. It seems to be in a similar place on each example, but I don't keep a record of where in the tank an individual bit of film sits.
The film I normally use is HP5+ although the example attached is noticeably the worst so far and happens to be Rollie Infra Red.
Can anyone suggest a cause and / or cure?