And, actually, I can agree with that. If you are using a pro-lab, they can tell you what ISO to use to get the best results with their processing. They should be familiar with your exposures and, as long as you are consistent in using your camera, they know which way you should adjust to make the best prints or slides.
My original comment was based upon someone outside the chain telling you what ISO you should use. Len --- ----- Original Message ----- From: "T Rittenhouse" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, March 28, 2002 7:11 PM Subject: Re: Re: Any experience with Fuji NPC? > 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 > -------------------------------------------------------------- -- - 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 .
