To expand upon TV's comment. Actually, if you are a pro, and use a pro-lab. The lab will probably tell you to use something like 100 to get the best from their set up. Of course, you can always use the manufactures rating. Because the guys running the lab just believe their way is the only way and you know better.
Historical note: In 1959 the film manufacturer's changed the film speed of almost all their negative films to approximately twice what it had been. No, the film didn't change. No, the processing didn't change. You can get contradicting reasons from knowledgeable photo historians for this change. But, it did happen. After the change negative film had, a one stop tolerance for underexposure and a two stop tolerance for overexposure. Before the change that was the reverse. Modern films have a wider band of tolerance, but continue to be rated at a speed that only allows one stop underexposure. That is why many think most negative films are slower than rated. And why many pro's use a lower speed rating. BTW, most pro film was only up rated about 2/3 stops. e.g. Tri-X went from 200 to 400, while Tri-X Professional went from 200 to 320. This is also why I tell people to use Sunny 11 rather than Sunny 16 when estimating exposure without a meter. It gives a higher percentage of usable negatives. The speed rating of slide films was not changed. Ciao, Graywolf http://pages.prodigy.net/graywolfphoto ---------------------------------------------------------------- ----- Original Message ----- From: tom <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, March 28, 2002 7:38 PM Subject: Re: Re: Any experience with Fuji NPC? > That, or they just think the film is overrated, and a bit more exposure is needed to get adequate shadow detail. > > tv > > On 28 Mar 2002 at 18:21, Len Paris wrote: > > > It's just "sage" advise given by someone who believes that their > > way of seeing is the only way to see. > > > > Len > > --- > > > > ----- Original Message ----- > > From: "Frits J. W�thrich" <[EMAIL PROTECTED]> > >> > > > I am not sure if I understand this. You want a portrait film, > > which has a > > > low contrast, and by setting the ISO setting lower you > > increase the > > > contrast? Is this why this advise is given? I have read the > > same advise on > > > Portra 160NC. I am confused, please help me. What is the > > advantage? > > > > > > Frits W�thrich > > - > - > 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 .
