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Thread: Dating Derogy lens

  1. #31

    Join Date
    Jan 2009
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    Re: Dating Derogy lens

    Some further special Derogy lenses.

    1. Late pillbox style with a third glass in the rear achromat. Not registered in Pont et Princelle. Serial number 22440.

    2. Derogy’s simplified version of the de Pulligny adjustible landscape. Serial no. 32995. The huge example shown in P et P is 60cm. This one has a gun metal finish and just F8 and efl 30cm.
    Attached Thumbnails Attached Thumbnails 1096D09B-68FE-4F93-8E11-6177F032DE0B.jpg   B77DE385-BCBC-4685-9B05-F025F04005B2.jpg   237B5ACE-50F4-454D-9E25-707FC7556DDF.jpg   601050CE-1AAD-4E37-8202-5B53632D960F.jpg  

  2. #32

    Re: Dating Derogy lens

    Hi all !

    I'm new on this forum... i have not found a "presentation thread" then i hope all is ok.

    I'm not a Large Format Photography specialist at all but i've found some things that may interest you here. I'm looking informations about these things :






    Could you tell me what is it exactly ? I've found some information on the internets but you here seems to be specialists !

    What i can say is that the number is 16 775. More, on one lens, there is written Derogy Lens 1902 but difficult to make a good picture of it as it seems to be written with pencil.

    Thanks a lot for your help,
    Craig

  3. #33

    Join Date
    Jan 2009
    Location
    Denmark
    Posts
    6,082

    Re: Dating Derogy lens

    A serial number of 16,775 suggests it was made in the early 1870’s. By 1902, Derogy was up to around 30,000! Derogy was not good about writing production dates on lenses. I suggest it was written there by someone servicing the lens in 1902 - perhaps regluing the lens.
    Size no. 3 should be a rectiliinear (aplanat) covering 13x18cm with a focal length of 22cm and a lens diameter of 33mm.

    The other lens is a more modern version of the Aplanat- with a multi-leaved Iris.
    Attached Thumbnails Attached Thumbnails B0363F42-DABA-4F3A-8686-A84E27D02867.jpg  

  4. #34

    Re: Dating Derogy lens

    OK thanks a lot for your reply ! Very Interesting...

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