[rollei_list] Re: Tessars
- From: Marc James Small <marcsmall@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Sat, 02 Jun 2007 23:53:08 -0400
At 06:33 PM 6/2/2007, Richard Knoppow wrote:
> My statements are based on experience with enough of
>both lenses to see a consistent difference. I am speaking of
>f/4.5 and f/6.3 Tessars and Ektars. Specifically, the
>135mm, f/4.5 Tessar and 127mm f/4.7 Ektar as used on Speed
>Graphic cameras. Both are excellent but the Ektar will show
>slightly better resolution. This can be seen in the aerial
>image as a slight increase in contrast of very fine detail
>like textures. I've examined both coated and uncoated Ektars
>but only uncoated Tessars.
Thank you, Richard, for the clarification. What
I believe you are saying is that Kodak LF Ektars
outperformed CZJ LF Tessars, an arena I am unable
to really enter as my knowledge of this is
entirely theoretical. This is much more limited
than, "all Ektars beat all Tessars" as you
initially suggested. Kodak used the term "Ektar"
as a word of art, and so there were several
designs behind lenses bearing this name but all
seem to have been more advanced designs than the rather simple Tessar.
I am surprised that you have never had the
opportunity to examine a coated LF Tessar. These
remained in production through the life of Carl
Zeiss Jena and briefly afterwards under the
tutelage of Docter Optics, and all of these were
coated from 1949 or 1950. There are a lot of
such lenses out there, and Zeiss-Opton and Carl
Zeiss, those Oberkochen dudes, also produced
Tessars for plate-camera use until the middle
1950's, though the later CZ LF lenses were of
more advanced designs and, in large part, Voigtländer-derived.
Marc
msmall@xxxxxxxxxxxx
Cha robh bàs fir gun ghràs fir!
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