Posted 30 December 2012 - 02:42 PM
If the exact same problem is cropping up with four different labs, I suspect it's not something going wrong when the film is being processed, unless they are all using the exact same method, chemicals, and technique. I used to develop my own color and black and white film in stainless steel reels, open tanks and even open trays. I have seen steaks on the film caused by overagitiation, damage due to heat, old film or bad chemicals, but nothing like this. The streaking you are getting could also be due to something being wrong with the film itself. Have you been hypering it with hydrogen or forming gas? Fogging can sometimes arise from that, the film could have been damaged also in some way from heat, x-rays or other factors beyond your control or the lab's. Are all your photos from the same batch of film? If you can, try shooting a test roll with a few daytime photos, the rest of the night sky, and try push processing it in an developing tank on a stainless steel reel. If the streak still persists, with a different method of processing it and different chemicals, I would say there is a problem in the film itself. Radiation damage is a real problem, high levels of radiation are used to inspect things now to look for contraband, but repeated exposure will also damage film that results in weird effects too.