Thank you all
Tin Can
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
I have added the summary table in #6 reply.
VoigtlanderPetzvalTransitionSummary20221216.pdf
https://www.largeformatphotography.i...=1#post1645764
Last edited by mhayashi; 15-Dec-2022 at 07:25.
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!
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.
I have found another important catalog which dates 1879, the year I was searching for. Very interesting and important progress to entangle the history.
Here is the link of the google book.
I have reflected the info I got about the rear elements glued petzvals designed by Hans Sommer to the pdfs.
Handbuch der practischen Photographie by Ludwig Gustav Kleffel in 1880.
https://www.google.co.jp/books/editi...C?hl=ja&gbpv=0
P508(P19 in the catalog) L. G.KLEFFEL & SOHN catalogue 1879. The divisions of the original to the improved focal lengths provide about 81.6% of focal length reductions. The numbers below are calculated from the ratio of the before and after focal lengths in the table.
But note the sample measurement 335mm f3.6 d92mm of the focal length doesn’t match any of the calculated result….
Also the original focal lengths in the P508(p19 in the catalog) don’t match to the focal lengths in the previous pages….
Trying to figure out these differences.
I updated the pdfs in #6 reply with the new findings and added the main engraving row and the serial number range row in the transition summary pdf.
https://www.largeformatphotography.i...=1#post1645764
As the supplementary info, here is the ad in 1879 for the older petzvals to be replaced by the rear glued “improved compound”.
The Photographic News
A Weekly Record of the Progress of Photography Volume 23
See p236.
https://www.google.co.jp/books/editi...aebFBQwC?hl=en
If you have Voigtlander petzval samples that contradict against the transition summary,
let me know.
Last edited by mhayashi; 21-Apr-2023 at 22:49.
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