> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of Don > Williams Finland > > > How can you say that Wheatfield Willie is right? That C41 > can't be pushed?
Maybe because he's got pretty good credentials and he's done his own experiments with contrary results? > 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 I don't want to get into an argument, nor do I want to give the impression that I'm not grateful for your efforts (I am), but I'm not sure I would call your experiment well-controlled, nor do I think it unequivocally demonstrates that C-41 can push 2 stops without degradation. In particular, I think there three aspects of your experiment which are questionable: - your metering method - your definition of film speed - the lack of a control film IMHO, the metering is key - if 1/125 wasn't the correct reading for ISO 400, you experiment just doesn't work. If you pull out a box of ISO 400, open it up and look inside you'll see various shutter speed / aperture recommendations. For "cloudy day/open shade" the recommendation is f/8 at 1/250. You described your conditions as subdued sunlight, so it wouldn't surprise me if 1/500th actually was the correct exposure for 400. In fact, the recommended combination for "hazy sunlight" is f/16 at 1/250. Film speed is determined by shadow detail. Your experiment needs a control film so you can compare shadow areas...if your results were correct, the shadow detail of the pushed film should be similar to the shadow detail of the unpushed film. More precisely, it's these densities that are to be compared. Also, a control film that was processed normally would give you a better idea whether your meter readings were correct - the one with the least exposure should look pretty bad. I think film is pushable to some extent having pushed hundreds of rolls myself, but I have trouble believing that color film can be pushed 2 stops with no ill effects. If this were the case, Fuji and Kodak would just relabel their films at a higher speed and tell labs to increase development 20%. tv - 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 .
