I'm just about to upload density scans to my web site. I think you'll see that the range, on the exposure where the film is rated two stops fast, is as good as you can get with colour negative film. But on the others it's quite hopeless. It's not hard to judge, it's impossible to tell what a negative is like by looking at a positive image on a monitor. You can calibrate and standardise all you like, but no two monitors will behave the same way. We need a reliable yardstick. I intend to pursue this work briefly and will do scans on some other negatives in my files and determine the density range. But this is an enormous field and one could devote years to the pursuit, something I have no intention of doing.
Don Dr E D F Williams http://personal.inet.fi/cool/don.williams Author's Web Site and Photo Gallery Updated: March 30, 2002 ----- Original Message ----- From: "Paul Stenquist" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, July 24, 2002 1:36 PM Subject: Re: Push Processing Film > Don't forget that most color negative films have a great deal of > latitude. That alone could account for some of your success. A push will > increase of course contrast somewhat so that even two stop underexposed > scans or prints are marginally acceptable. But normal development of one > stop underexposed film will also yield acceptable results. I looked at > your results and felt that the highlights were seriously absent. > Although it's hard to judge from scans on a computer screen. > Paul > > Don Williams Finland wrote: > > > > How can you say that Wheatfield Willie is right? That C41 can't be pushed? > > I've just carried out a well controlled experiment and the results show > > unequivocally that it can be pushed quite nicely. Take a look. > > > > http://personal.inet.fi/cool/don.williams/hold/index.htm > > > > Don > > > > Dr E D F Williams > > > > Author's Web Site and Photo Gallery > > Updated: March 30, 2002 > > > > ----- Original Message ----- > > From: "Joseph Tainter" <[EMAIL PROTECTED]> > > To: <[EMAIL PROTECTED]> > > Sent: Wednesday, July 24, 2002 4:36 AM > > Subject: Re: Push Processing Film > > > > > I found this, however, on the Kodak web site: > > > > > > > > "With longer development times, such as those used in push processing, > > EI > > > > values actually do increase, but only slightly. Underexpose a film by > > two > > > > stops and give it a two-stop push, and the real film speed will > > typically > > > > increase by perhaps a half stop. This means that the film is really > > > > underexposed by only 1 * stops, not two stops. But it is underexposed. " > > > > > > > Wheatfield Willie's been saying for some time that you can't push C-41. > > > I guess maybe he's right. Now I've definitively learned something. > > > > > > E-6 can be pushed. If you take an ISO 100 transparency film and push it > > > two stops, some people prefer 320, others 400. It also varies by film. I > > > guess the 320 would give better shadow detail, which is decreased in > > > pushing because contrast increases. > > > > > > Joe > > > - > > > This message is from the Pentax-Discuss Mail List. To unsubscribe, > > > go to http://www.pdml.net and follow the directions. Don't forget to > > > visit the Pentax Users' Gallery at http://pug.komkon.org . > > - > > This message is from the Pentax-Discuss Mail List. To unsubscribe, > > go to http://www.pdml.net and follow the directions. Don't forget to > > visit the Pentax Users' Gallery at http://pug.komkon.org . > - > This message is from the Pentax-Discuss Mail List. To unsubscribe, > go to http://www.pdml.net and follow the directions. Don't forget to > visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
