Archived posting to the Leica Users Group, 2000/08/07
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]on 7/8/00 4:01 pm, Craig Roberts at croberts@zoomtel.com wrote: > "The flare helps to get to that threshold so it takes slightly less image > exposure to show up as density." - Ed > > > Hmmmm. Thank you, Ed, but this sounds...almost literally...like smoke and > mirrors, or a sophisticated practical joke. I prefer not to think about it > any longer. My brain hurts. Oh, Craig, sit down, take some Advil and listen! Say it takes 5 units of light to 'activate' a film grain so it can be developed. Let's say you're getting 4 units of light in through the contrasty lens, so the grain doesn't get developed. So no shadow detail there. In the flarey lens let's say you get 1 unit of flare all over the film. Now add that to the 4 units coming in as before, you get 5 units. Ergo, you get shadow detail. That's the theory and the number mean nothing and the reasons why it might not work in practice are blindingly obvious even in this little thought experiment, but the concept is pretty simple. - -- Johnny Deadman http://www.pinkheadedbug.com