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Thread: What kind of lens has aperture scale in mm?

  1. #31

    Join Date
    Nov 2017
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    279

    Re: What kind of lens has aperture scale in mm?

    Quote Originally Posted by Ron (Netherlands) View Post
    Hi Dan, thanks for the links, however in my browser there is a starry wheel but without the option to download (therefore non of the pdf's in your listings can be downloaded). Could you insert a direct link to the 1901 pdf - like you've done with the post war II pdf?

    many thanks
    Ron
    If you cannot download, then it is a copyright limitation of where the book is, and where you are. Here in Belgium you can also not download pdf books from Google books. Only way is going through a foreign proxy.
    Expert in non-working solutions.

  2. #32

    Join Date
    Sep 2017
    Posts
    134

    Re: What kind of lens has aperture scale in mm?

    Quote Originally Posted by Dan Fromm View Post
    For a time -- some time in the 1890s to early 1900s -- Carl Zeiss Jena scaled apertures in mm. See, e.g., the 1901 CZ London catalog, which has an extensive discussion. There's a link to it in the list.

    XVIsub1 is very Zeissish. See the 1910 CZJ catalog p. 14, there's a link to it in the list too.
    It indeed was a Zeiss lens - 500mm f/4.5 Tessar. The name was under the tape that had been wrapped around the top of the barrel.

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