[rollei_list] : changing lens formulas
- From: "Jerry Laderberg" <jerry@xxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Mon, 5 Nov 2007 14:07:41 -0500
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
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