[rollei_list] Re: Tessars
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Thu, 31 May 2007 18:58:35 -0700
----- Original Message -----
From: "Peter J Nebergall" <iusar4s@xxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Thursday, May 31, 2007 7:05 PM
Subject: [rollei_list] Tessars
Question for the group: I have2 Automats with 3.5
Tessars. One has the
expected Opton-Tessar, coated, but the other, a bit older,
Very
different, has been re-lensed with a Carl Zeiss Tessar, a
much newer
lens. My question: the CZ tesar beats the daylights out
of the Opton.
what was the difference in formula between the coated Jena
3.5, coated
Opton 3.5, and the later CZ 3.5? Is this a better lens,
or just an
individual in better condition?
Peter Nebergall
---
How did you determine the age of the two lenses?
Zeiss held a great many patents for Tessar type lenses.
Its nearly impossible to determine which are for production
lenses. Note that the Kodak Ektar is a Tessar type lens and
generally outperforms Zeiss lenses of the same era, so its
possible to make a better Tessar. What is different,
impossible to know without having the prescriptions for
both, perhaps glass, perhaps something else.
Its possible one lens is just better than the other,
its also possible that the camera with the poor lens is not
quite in adjustment. If the camera does not focus accurately
or if the lens is slightly out of parallel it could mimic
some lens defects.
Looking at the aerial image using a very high quality
low power microscope might give some clues as to what the
differences are.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
---
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