On 5/30/05 8:39 AM, "Carlos Manuel Freaza" <cmfreaza@xxxxxxxxxxxx> typed: > Mark, the characteristic curves is linked to the > process used to develop the film. Kodaks says." A > characteristic curve is a graph of the relationship > between the amount of exposure given a film and it's > corresponding density after processing. (Kodak)".In > other words the difference that you can see between > the APX 100 and the Scala in the Agfa technical sheet > is originated because they were made considering two > processes different completely, negative process for > the APX 100 and positive process for the Scala, more > the push and pull process for the other curves in the > graphs for the Scala. The curve for the Scala would > change if processed like a negative film. > In the other hand, the Spectral Sensitivity shows the > film behavior without the development process > influence, and then it shows that the APX 100 and the > Scala are identical for the way they capture the light > reflected from the subject, it coincides with the > historic data saying the Scala is based on the APX > 100, a different thing is the film processing and the > characteristic curve after the process. > It would be very interesting to compare the Scala and > APX 100 characteristic curve after to process both > film using Kodak D 76, in example.- > > All the best > Carlos > > Except that Agfapan 100 in use is one of the most wide range and smooth films out there. And the results you'd get from a Scala slide in use would be the opposite of that. The direct opposite. A VERY short tonal scale being a slide. So saying they are the same to me kind of gives off the wrong message in a confusing way. Chief Justice Scala himself even said this in his last address. He said "Phooey on Agfapan 100!" Then hit his hammer. Mark Rabiner Photography Portland Oregon http://rabinergroup.com/ --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list