Voigtlander B serial transition to Portrait Objectiv serial engraving & Nomenclature

[mhayashi]

Additional photos
Acknowledgement: all of these pictures are from Andreas Mros.

[mhayashi]

More photos.
Acknowledgement: all of these pictures are from Andreas Mros.

[Tin Can]

Thank you all

[mhayashi]

Thank you, Tin.
I have updated the pdfs, based on new info according to Hartmut Thiele's book, arrived from Germany today.
https://www.largeformatphotography.i...=1#post1645764

Voigtländer: Fabrikationsbuch Photooptik.
Alle Photoobjektive, Spezialobjektive, Fertigungsnummern, Fertigungszeiten, Mengen und Kameraanpassungen von 1884 bis 1972.
Von Hartmut Thiele.

332 Seiten (ausschließlich Tabellen), 21 x 29,5 cm, 4., überarbeitete und erweiterte Auflage, München 2022, broschiert

Bestell-Nummer: 64017V

https://www.lindemanns.de/shop/fotob...photooptik.php

[mhayashi]

I have added the summary table in #6 reply.
VoigtlanderPetzvalTransitionSummary20221216.pdf
https://www.largeformatphotography.i...=1#post1645764

[mhayashi]

Visiting Foto:Mutori to check the optical design of Portrait Objectiv Ia 10cm, made in 20/6/1901 according to Thiele’s book.

It turns out the design is modified dallmeyer design, from the subject to the GG,
(VV-CV)-A-(CV-A-CV).
Note it’s not C in the front inner surface as in (VV-CC)-A-(CV-A-CV) as in the original Dallmeyer design.

V convex
C concave
A air spaced

The rear concave and convex curvatures are very strong, spacer ring spaced yet rear elements being very close together, the signature of Hans Zincke Sommer design, being modified by Harting.

Very interesting feature of the aperture mechanism in front of the front lens.

I shall update the Voigtlander transition table accordingly. But I also need to check other Ia’s, as the optical design might be different depending on the focal length.

Thank you Kimura-san for cooperation!

[mhayashi]

Some more pics of the above Ia lens.

[mhayashi]

More pics.

[mhayashi]

I have updated the VoigtlanderPetzvalTransitionSummary20230209.pdf in the #6 reply.
https://www.largeformatphotography.i...=1#post1645764

Proto-6 generation may not exist but I added the column for it in the table.
But there are some descriptions that support the possible existance.
Only samples attest the existance. The serial numbers should be in the range from 28764 to 35758.
If you have a Voigtlander petzval sample in this range, please let me know. I want to know the detail about your sample.