William Robb wrote: > ----- Original Message ----- > From: "graywolf" > Subject: Re: MX and battery level. > > >> Now for the people who are going to take me to task for using ASA instead >> of >> ISO, you know who you are. ISO is a combination of ASA and DIN ratings, if >> you >> are not using both it is not properly an ISO rating. > > I believe that ASA (American Standards Association) ratings were adopted by > the ISO (International Standards Association) a couple of decades ago. The > Europeans then dropped the German DIN rating, which was a logarithmic > system. > The DIN rating system has nothing in common with the ASA/ISO rating. > > William Robb > >
That's actually incorrect. The ISO rating is a combination of the ASA and DIN ratings. ASA400 film is DIN 27 is ISO 400/27. We traditionally drop the DIN portion of the ISO rating as it simply duplicates the ASA portion and the ASA rating scheme has very distinct advantages (Like the Sunny 16 rule). Check your film boxes, the DIN half is still there. -Adam -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
