You misunderstand, I'm speaking about the notation. For example Kodachrome 64
ASA = 64 DIN = 19º ISO = 64/19º it works for all film speeds of course ASA = 100 DIN = 21º ISO = 100/21º ASA = 400 DIN = 27º ISO = 400/27º The international standards organization happily took both notations in general use and combined them into one. ASA is easier to relate to shutter speeds and apertures once you understand them but that wasn't my point. Jens Bladt wrote: >Noooo... >ASA - doubleing the values means halving the shutter time - a numeric/linear >scale. >DIN is a logarithmic scale - 3 DIN means twice or half as much light. >It's true that Scheiner and Weston are 1/3 stops apart. >http://home6.inet.tele.dk/haagen/ei.htm > >This table does not mention BSI. > > >Jens Bladt >http://www.jensbladt.dk >+45 56 63 77 11 >+45 23 43 85 77 >Skype: jensbladt248 > >-----Oprindelig meddelelse----- >Fra: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] vegne af P. J. >Alling >Sendt: 19. oktober 2006 19:34 >Til: Pentax-Discuss Mail List >Emne: Re: BSI - film speed system etc > > >Yes but they don't bother telling you that ASA = BSI = ISO and that ISO >is just the combination of the ASA value and the DIN value in a single >notation, (and most people just leave off the DIN value). > >Bob W wrote: > > > >>BSI and ASA apparently used the same numbering system, according to >>this web page: >>http://www.photographytips.com/page.cfm/1591 >> >>BSI was obviously superior in all other respects, of course. >> >>That looks like a nice camera. I'd like one of those sometime. >> >>-- >>Cheers, >>Bob >> >> >> >> >> >>>-----Original Message----- >>>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On >>>Behalf Of Jens Bladt >>>Sent: 18 October 2006 21:56 >>>To: Pentax-Discuss Mail List >>>Subject: OT: BSI - film speed system etc >>> >>>Is this fairly the same as ASA/ISO? >>>I recently got this 1955 Agifold camera. The extinction >>>meter/calculator has >>>SCH (Scheiner-Grad) and BSI (Brittish Standard Institute) >>>film speed scale. >>>I wonder if BSI is equal to ASA? >>>Please take a look: >>>http://www.flickr.com/photos/bladt/273145251/ >>> >>>Does anyone here have experiences with Ensign 820 (6x9) or >>>Ensign Autorange/ >>>Ensifn 16-20 (645), please? >>>Thanx >>>Regards >>> >>>Jens Bladt >>>http://www.jensbladt.dk >>> >>>-- >>>No virus found in this outgoing message. >>>Checked by AVG Free Edition. >>>Version: 7.1.408 / Virus Database: 268.13.5/482 - Release >>>Date: 10/18/2006 >>> >>> >>>-- >>>PDML Pentax-Discuss Mail List >>>[email protected] >>>http://pdml.net/mailman/listinfo/pdml_pdml.net >>> >>> >>> >>> >>> >>> >> >> >> >> > > >-- >Things should be made as simple as possible -- but no simpler. > > --Albert Einstein > > > >-- >PDML Pentax-Discuss Mail List >[email protected] >http://pdml.net/mailman/listinfo/pdml_pdml.net >-- >No virus found in this incoming message. >Checked by AVG Free Edition. >Version: 7.1.408 / Virus Database: 268.13.7/488 - Release Date: 10/19/2006 > >-- >No virus found in this outgoing message. >Checked by AVG Free Edition. >Version: 7.1.408 / Virus Database: 268.13.8/489 - Release Date: 10/20/2006 > > > > -- Things should be made as simple as possible -- but no simpler. --Albert Einstein -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
