Archived posting to the Leica Users Group, 1998/11/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Walter- Your story brought back memories- the idea of flashing film . The theory behind that is that film has a threshold at the toe- no density at all until that point is reached- I believe it is called the 'Speed Point' because the amount of light to attain that point on the 'toe of the DlogE curve determined the film speed. If you gave the film just enough exposure to get it to reach that 'speed point' then any additional exposure would help bring up the shadow detail! Tricky business- we used a dark green safelight at about 4 feet for a few seconds- then re-spooled it! We used to 'flash our Tri-X when I was in high school so we could photograph the night football games with the flashes we had available in 1965! We also tried fuming the film in ammonia fumes to make it more sensitive, but that didn't work out too well. It's refreshing to know we weren't totally out in left field then! Dan dwpost@msn.com