There may be a similar Schneider document, but the one to which I am referring was Zeiss... no ifs ands or buts... Eric Goldstein -- On 11/5/07, Jerry Laderberg <jerry@xxxxxxxxxxx> wrote: > I recall the document as being attributed to Schneider, not Zeiss. > > > ----- Original Message ----- > From: "Eric Goldstein" <egoldste@xxxxxxxxx> > To: <rollei_list@xxxxxxxxxxxxx> > Sent: Sunday, November 04, 2007 7:50 PM > Subject: [rollei_list] Re: changing lens formulas > > > > There is a famous Zeiss document which may account for this. It used > > to be up on the web but I have not found it for many years. It was a > > paper describing a pivotal decision for Zeiss... if I am remembering > > correctly, their research into end users revealed that resolution in > > excess of 40 lp/mm was seldom needed. As lenses could be apotised to > > favor either resolution or accutance/edge contrast, and it was the > > later which was the major factor in perceived "sharpness," they were > > moving in that direction. Just about every other major manufacturer, > > with the exception of Canon, followed. > > > > I used to have the doc as a pdf but have not been able to find it... > > perhaps Carlos knows of it and it's location... > > > > > > Eric Goldstein > > > > > > --- > Rollei List > > - Post to rollei_list@xxxxxxxxxxxxx > > - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' > in the subject field OR by logging into www.freelists.org > > - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with > 'unsubscribe' in the subject field OR by logging into www.freelists.org > > - Online, searchable archives are available at > //www.freelists.org/archives/rollei_list > > --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list