What focal length lens is this lens?

Discussion in 'Question of the Day' started by ship, Jan 31, 2012.

  1. ship

    ship Senior Team Emeritus Premium Member

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    Know I have posted this formula in the past but otherwise fair game to all before I check my notes or spare lenses to compare with:

    Got a 100+ year old set of 3.1/2" lenses to a lens accessory on a starlight sciopticon assembly that does a lens train in front of the wheel in refining the image. Page 18 in the lens train to Chicago Stage Lighting Co. Catalogue (CB WiKee) - in this case by Kliegl as a maker of this specific lens train.

    Lenses measer 3.1/2" wide by 7/16" thick when standing on the convex side.

    What size of Altman 3.5Q lenses - given these measured are toast should I replace them with?
    Last edited by a moderator: Jan 31, 2012
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