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Thread: Petzvals: Which is Crown, which Flint?

  1. #1

    Join Date
    May 2006
    Location
    Scarsdale, NY
    Posts
    291

    Petzvals: Which is Crown, which Flint?

    I've been farting around with a Petzval for a while, and decided I'd better ask wiser folk than I about the rear elements, before I go and put my foot in my mouth and call one by the other's name.

    Below is a photo of the rear elements: one thick, one thin. As shown, the thick one is mildly convex on the top, and pronouncedly concave on the bottom. The thin one is noticably convex on the top, and mildly convex on the bottom.

    Who's who?

    Charley
    Attached Thumbnails Attached Thumbnails Rear-Elements.jpg  

  2. #2

    Join Date
    Mar 2010
    Location
    New Jersey, USA
    Posts
    375

    Re: Petzvals: Which is Crown, which Flint?

    The one on the left is the flint and the one on the right the crown. You might enjoy this article.

    Dan

  3. #3

    Join Date
    May 2006
    Location
    Scarsdale, NY
    Posts
    291

    Re: Petzvals: Which is Crown, which Flint?

    Dan:

    Yes, that's my "go-to" site for Petzval info. The different thicknesses of the glass made me doubt my own judgement.

    Charley

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