Hi, my experience with Tech Pan is using for astro work and as such have come across some of the history. Apparently started as a film for taking shots of atom bomb tests, technidol was developed to give extreme contrast range. Grain and contrast are both highly variable with devloper used and time. I develop astro negs for 12 mins in hc-110 dil B. But you would't want to do that for pictorial work!! The other original use for T-Pan was taking shots of the sun in H-Alpha light, normal (Panchromatic) film is almost insensitive to this wavelength, but tech pan has very good sensitivity, unique among B&W film I believe.(posted 8916 days ago)I am interested to try pictorial work with this film, can some one give me some info on PMK and TD-3. I am an Australian (living in Thailand for the moment) I'm don't know if this sort of stuff is available here. I have often wondered how those glowing highlights were obtained, and had assumed a bigger piece of film than 35mm was a big help.