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Thread: Is my 210mm Computar f9 convertible?

  1. #1

    Join Date
    Jul 2016
    Posts
    83

    Is my 210mm Computar f9 convertible?

    Iíve seen versions of this lens that have a double aperture scale, where you remove the rear element and you effectively have a 370mm lens. Mine does not have the double aperture scale. Does that mean I cannot remove the rear element and get the same 370mm convertible as the ones with double aperture scale? And if so, whatís the difference?


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  2. #2

    Join Date
    Dec 2013
    Location
    Washington, DC
    Posts
    46

    Re: Is my 210mm Computar f9 convertible?

    All versions of the Computar/Kyvytar/Kowa Graphic 210 lens are convertible. With the front cell removed, the Computar becomes a 370mm f/18 lens. If your shutter does not have the factory original double aperture scale, you can simply double the existing aperture values when using the rear cell by itself, e.g. f/16 becomes f/32 when converted.

    When I purchased a new old stock Graphic Kowa 210 in barrel and transfered it into a Copal 1, I paid SK Grimes to engrave the double aperture scale. When I saw that all the values were simply doubled, I felt a little foolish; I thought it would be a much more complicated endeavor.

  3. #3

    Join Date
    Jul 2016
    Posts
    83

    Re: Is my 210mm Computar f9 convertible?

    Awesome! Thanks so much!


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  4. #4

    Join Date
    Dec 2013
    Location
    Washington, DC
    Posts
    46

    Re: Is my 210mm Computar f9 convertible?

    It’s a great family of lenses. Enjoy!

  5. #5

    Join Date
    May 2016
    Posts
    403

    Re: Is my 210mm Computar f9 convertible?

    Quote Originally Posted by Dhuiting View Post
    I’ve seen versions of this lens that have a double aperture scale, where you remove the rear element and you effectively have a 370mm lens.
    Quote Originally Posted by Whir-Click View Post
    With the front cell removed, the Computar becomes a 370mm f/18 lens.
    It's nice to see how perfectly you agree with each other...

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