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  1. Re: Anyone have info about an Exelsior casket set?

    Thanks everyone for the info! BTW during research I found there are several public domain works on archive.org, including old catalogs and early books. Exelsior popped up too but like Steven says it...
  2. Anyone have info about an Exelsior casket set?

    Can anyone help me with info about an Exelsior casket?
    It's marked Exelsior I, not Excelsior and consists of 7 elements (15,25,35,45,55,65,75) and an iris diaphragm in the barrel.
    Shortest focal...
  3. Re: Anyone recognise this Goerz 120mm Double Anastigmat?

    Thanks Andrew & Dan! Also found Dan's onedrive info - great resource!
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    Re: Are all Goerz Double Anastigmats Dagors?

    What they say in another catalog is that the Hypergon is distortion free but not corrected for "aberrations spherique et chromatique". Their argument is that it's not necessary to correct because the...
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    Re: Are all Goerz Double Anastigmats Dagors?

    198706
  6. Anyone recognise this Goerz 120mm Double Anastigmat?

    Here's another one I can't identify (yet). It's a Goerz Doppel Anastigmat Series III/0 F=120mm, serial no. 108507.
    It doesn't look like the DA's Series III/0 I found so far and the F-stops are...
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    Re: Are all Goerz Double Anastigmats Dagors?

    My Goerz catalog under "Goerz-Double-Anastigmat" lists:
    Dagor, Celor, Syntor, Alethar, and Hypergone. The Celor is in Series Ib/c/d. The Dagor is in Series III and IV, Syntor is Series Id, Alethar...
  8. Re: Anyone have dates for a Berthiot Casket set?

    Thank you Daniel!
    BTW just found your publication about anastigmats - excellent work and thank you for making it!
  9. Anyone have dates for a Berthiot Casket set?

    Anyone have more info so I can pin down the date of this casket set?
    A similar set is mentioned in a 1889 catalog from Charles Fabre, so it must have been around then.
    It is a No.1 set by C....
  10. Re: Hermagis Serial numbers Need your help with a database

    Adding details of my Hermagis Anastigmat 4,5/500mm #122229 for the database before selling it. Iris diaphragm.
    According to Corrado it is a: SYMMETRICAL LENS 4 LENSES IN 4 GROUPS NOT GLUED AS THE...
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