[rollei_list] Re: VoigtlanderApo Lanthar


----- Original Message ----- From: "Eric Goldstein" <egoldste@xxxxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Saturday, August 13, 2005 5:38 PM
Subject: [rollei_list] Re: VoigtlanderApo Lanthar


Does any one have experience with the legendry Voigtlander
Apo Lanthar?
Does any one know why they reach such high prices.


Regards,
Marvin.
P.S. SMILE PHOTOGRAPHY IS FUN!



Here is some discussion and references:

http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=00D4XG

http://yandr.50megs.com/vt/lenses/pro.htm


Eric Goldstein

The first is a catalogue showing construction. It is interesting that the Universal Heliar, a soft focus lens for portraiture, uses Hans Hartings original Heliar construction, i.e., with the negative elements facing outwards. Kingslake states that this lens had excessive coma, field curvature, and astigmatism. Hartings second version reversed the order of power and put the positive elements of the cemented doublets facing outward, this was a better lens but still not a very good one. The second design was called the Dynar. Later Voigtlander changed this to Heliar because they liked the name better. Despite Harting's lack of success the design is capable of producing excellent lenses. Later Voigtlander designs followed the generic type but not Harting's design.
Voigtlander does not actually state that the Apo Lanthar is apochromatic, it probably isn't, but still could have very low chromatic aberration. The Heilar type is inherently symmetrical so it has low lateral color.
I attributed the Kodak series to George Aklin, bad memory, it was Fred Altman, the patent is USP 2,279,384. The Pentac, designed by Lional Booth is USP 1,421,156
Harting's original patent is USP 716,035, the Dynar is USP 765,006 A later Heliar, designed by Albrecht Tronnier is USP 2,645,154 and another issued at about the same time is USP 2,645,156.
Zeiss patents from the mid 1950's include a couple of Heliar types, USP 2,764,062 Gunther Lange is an example.
BTW, Tronnier also designed a five element Planar/Xenotar type described in USP 2,670,659 I have no idea if this was ever produced or, if so, in what camera or cameras it might have been used.

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 

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