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    Re: Strange Petzval

    My guess is that the writing has been made by someone who has redone the balsam at some stage in the German speaking part of Europe. I think there is some background text which is now completely...
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    Re: Strange Petzval

    Marion was a unusual rare company with both a thriving Paris and London company. They may have commisioned optics, cameras and ancillary photographic items on which they put their own name. Both...
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    Re: Lerebours Serial Number - Rice Writing

    Thanks for data! I have already added to the list on page 7.
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    Re: Deardorff: "New" vs Old?

    Here is example of a post Deardorff item (Jack Deardorff Photographic Products -DPPI Indiana).4x5 back for the 5x7 Special. OK build with stainless steel.
  5. Re: What is this adapter on my Dallmeyer Pentac 2.9/8" for?

    Once upon a time (post WW2) there was a shortage of affordable lenses for, especially, 35mm cameras, but a lot of cheap fast ex military large format lenses were available.
    So lots of people got...
  6. Re: Objective without signature, but lens has writings at the edge

    I have posted a very large number of “intentionally bad photos” from the P et P with their permission and have mentioned them many times in many threads. I assume that their very distinct...
  7. Re: Objective without signature, but lens has writings at the edge

    Best guess for 33 is obvious focal length of 33cm. Millimeter is a more modern photograph convention!

    There is no certain knowledge about who made the brass work for A.Darlot and Jamin. The only...
  8. Re: Objective without signature, but lens has writings at the edge

    Many Jamin and early Darlot lenses were delivered to camera makers, and perhaps also retailers, without brass engravings. Might have something to do with the Franco-German animosities . The 1869 date...
  9. Re: Voigtlander No.6 petzval in 1857: a case study and catalogs before 1857

    Blue filters will really darken the image by a lot.

    What I was thinking about was just use of either a blue filter - or better blue glass lamps with regular spaced black lines - to determine what...
  10. Re: Voigtlander No.6 petzval in 1857: a case study and catalogs before 1857

    A very comprehensive analysis of the Voigtlander dilemma of coping with the built-in disparity of seen and registering focus of the original Petzval design. I have never seen a scale inscribed inner...
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    Re: Some Soft Focus Lens Sales Information

    The bidding for the Namias was quite ridiculous in the last few seconds. A very rare item - but identical with the more common anacromatique from Darlot, Ligney etc. An empty barrel for another...
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    Re: Deformed Wood Frame

    The problem with this “tool” is that you can only “fix” 2 of the 4 corners in a single operation. Never all 4 corners because of the limited depth.
    In addition, no matter the force applied, the...
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    Re: is this part of a projector lens?

    Indeed it is!
    It is from a period when a variety of focal length objectives were available for projectors. This is a mount - into which these alternative optics would fit. No screw threads or...
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    Re: Your Oldest Lens

    I think you are probably underestimating the age of this “Slater” lens by a decade - or more!
    The lens looks more French than English - especially the double edged focusing wheel and the unique...
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    Re: Ottewill folding sliding box camera

    I didn’t try to get beyond this page.
    Perhaps some else can get it. I doubt it has the dimensions,though.

    https://www.nature.com/articles/143849a0
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    Re: Ottewill folding sliding box camera

    Perhaps the Science Museum at South Kensington or the Bradford Kodak collection will let you examine their examples.
    I think it would be more difficult to gain access to the very few privately owned...
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    Re: Ottewill folding sliding box camera

    Ron - I am sure you have done a very extensive search for data, but have you checked for the original patent/registration from 1853?
    These usually contain quite detailed drawings and dimensions....
  18. Re: Hermagis Serial numbers Need your help with a database

    I have added another pre-serial number small Petzval to the list on post #68. I have called it VVVV. It is the same size as YYYY.
    It would be fantastic IF the mystery numbers were the same on...
  19. Re: I need help with a camera I just got (ICA Sirene 135/1)

    Although, single metal cassettes were the standard for these cameras, many owners started to use film packs - which were ideal for family gatherings and trips to the zoo. These are much deeper and...
  20. Re: Running Book Review: D’Agostini/Rose - 19th Century Great Britain & Ireland Lense

    Yes I fully expected two gentlemen to jump into the “Grubb” discussion - which is why I said very little! And they contribute more than I could about the validity of the section and how comprehensive...
  21. Re: Running Book Review: D’Agostini/Rose - 19th Century Great Britain & Ireland Lense

    After further Reading…..!

    The first section covers both pre- 1839 approaches and the explosive developments after that time. Both the UK and France are included in spite of the title. It is really...
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    Re: Lenses and their "personality"..

    I think the modesty bars have been added since the original posting.
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    Re: Lenses and their "personality"..

    Emil has been absent for some time, but I think I can answer the question!

    Dallmeyer made 2 series of landscape lenses.

    - The wide angle landscape lens ( Patent) made in 10 sizes.

    - The...
  24. Re: Hermagis Serial numbers Need your help with a database

    There have been some additions to the list (post #68) in the last few months.
    Nothing that adds to our “cumulative knowledge and guesswork”, but also nothing that contradicts start of serial numbers...
  25. Re: L. de Pulligny - C.Puyo - Objectifs d'Artiste

    Check if the engraving says “….Trousse….” . If it does, then there should a total of 4 lenses to be complete! If there are just 2 mounted, then check if the lens cells aren’t marked “T” or other...
  26. Running Book Review: D’Agostini/Rose - 19th Century Great Britain & Ireland Lenses.

    This is the 3rd book which Corrado D’Agostini has been associated with. The first two covered France and Germany, respectively.

    The book can be obtained from Corrado. There may be alternative...
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    Re: image circle schnellarbeiter

    this is a bit like “How Long is a piece of string?”.
    depends on your use of a Petzval as the curvature is very marked because of very limited depth of focus at F3.
    Nearest I can think of is a...
  28. Re: L. de Pulligny - C.Puyo - Objectifs d'Artiste

    There is at least one member here (based in the USA) who has the original booklet, so if there is a page which is missing or badly scanned, he/she might be able to help!
    There is an awful lot of...
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    Re: Help identifying a RO&C Co lens

    I think the key search word should be Wollensak - rather than the “Rochester” companies. This is where I found the following pages.

    But it is possible there are other combinations of auto...
  30. Re: Whar are the implications of using a thicker ground glass than is standard?

    The only consequence is that the camera is a little heavier and the brass tab mounting system may need a little adjustment.
  31. Re: Voigtlander B serial transition to Portrait Objectiv serial engraving & Nomenclat

    Now I have a bad conscience!

    I started to write a contribution some days ago, but realized that it would take the best part of an hour to formulate what I wanted to say!
    I started with mentioning...
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    Re: Cooke Portrait Lens Serial Numbers

    Well well, I never realized that the first Cooke soft portrait series II used the rear cell for adjustment, rather than moving the central lens forward as in later series II and VI. And the maximum...
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    Re: Mattioli shutter

    I have only the more primitive “Le Perpetuel” shutter by G.Mattioli - which is still working!
    It looks similar to the contemporary Italian and German shutters (LUC etc.) which have simple springs...
  34. Re: Replacement Bellows for 8x10 Sinar Norma

    Another very happy multiple user of Custom Bellows. It is an enormous advantage that they have years of experience with Sinar.
  35. Re: Dallmeyer 3"=75mm Rectilinear Patent lens query

    Here is data for the 3 1/4 Dallmeyer - of which the Ross is a clone.
    These were made for decades!
    Possibly cover 1/2 plate but probably dark corners!

    The 3” Dallmeyer rectilinear lens is just a...
  36. Re: Hermagis Serial numbers Need your help with a database

    Just to present a nice example of an early Objectifs a transformations (convertible) or rather the lens edge writing on the front achromat.
    This is before date/year writing was started, but after...
  37. Re: What is a A. J. Thompson & Co Petzval lens about?

    G&C became C&G (Clement & Gilmer) after being Laverne for a period. Most of the G&C series were continued. The best coverage of the smaller French makers is the the A to Z Pont/Princelle booklets....
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    Re: Lens element sources and specs?

    This is the voice of reason and insight!
    Unless we have a person of unlimited wealth (and limited common sense) within the LF community, there is no chance of new production of lens elements that...
  39. Re: What is a A. J. Thompson & Co Petzval lens about?

    Gasc & Charconnet ceased to exist after 1877, so if GC on the lens rim means Gasc & Charconnet, then the glass was made before this date. The brass looks more like the 1890’s or early 20th century. I...
  40. Re: What is a A. J. Thompson & Co Petzval lens about?

    I’ll some ideas I will check out tomorrow.

    But as a starter, I don’t believe that Darlot - at least by the 1890’s - actually Manufactured their own brasswork.

    The tall 4 iron screws on the...
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