Originally Posted by Michael R 1974
Fine, maybe it wasn’t hiding very well. But let’s take a look at the value of the negative density range – 1.05. That falls right in the center of the grade 2 paper LER range.
Originally Posted by Bill Burk
Kodak has a negative density range of 1.05 using a CI of 0.56. This diagram has been frequently reproduced. Kodak’s technical data sheets also use 1.05 and CI 0.56 (more recently CI 0.58). Many books and publications have this value. Many books show how flare reduces the scene’s apparent luminance range within the camera. How a 7 1/3 stop scene is reduced to a 6 1/3 or even 6 stop exposure range at the film plane. The log exposure ranges for various grades of paper are also reproduced in books and publications. A grade 2 is generally listed as being from an LER of 0.95 to 1.14. That fits in perfectly with the 1.05 negative density range.
These numbers are reproduced over the place. It’s hard to miss them, so why do people still insist on negative density ranges of 1.20 to 1.35? Shouldn’t the difference between the two sets of numbers at least create some questioning in people’s minds? The information is right there. How can it be missed? I thought it all had to be hiding in plain sight. Maybe by pointing out these values, they will suddenly appear and become noticeable in all those books and publications.
Last edited by Stephen Benskin; 01-20-2012 at 09:38 PM. Click to view previous post history.