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Thread: An old brassie stereopticon lens

  1. #1

    Join Date
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    San Joaquin Valley, California
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    An old brassie stereopticon lens

    I've been going through my storage room trying to get all my photography stuff organized and I came across a rather large (5-1/4" long and 3-3/4" across) lens marked

    McIntosh Stereoopticon Co.
    Chicago
    H-15

    It looks to have a focal length around 12"
    Any idea what type of lens it could be?
    Perhaps a Pretzel?
    Does anyone here have one of these?
    I steal time at 1/125th of a second, so I don't consider my photography to be Fine Art as much as it is petty larceny.
    I'm not OCD. I'm CDO which is alphabetically correct.

  2. #2

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    Re: An old brassie stereopticon lens

    Breaking news!
    I found another marking
    15 in. EF

    I opened her up and there is one lens (group?) at either end of the long empty barrel.
    Its a very simple looking lens
    I steal time at 1/125th of a second, so I don't consider my photography to be Fine Art as much as it is petty larceny.
    I'm not OCD. I'm CDO which is alphabetically correct.

  3. #3
    loujon
    Join Date
    Feb 2007
    Location
    Western, PA.
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    Re: An old brassie stereopticon lens

    Sounds like a Magic Lantern lens of either Petzval or triplet configuration as McIntosh was a Magic Lantern manufacturer.

  4. #4

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    Re: An old brassie stereopticon lens

    I need to find a board to stick this on pronto!
    Imagine, stereo swirlies!
    I steal time at 1/125th of a second, so I don't consider my photography to be Fine Art as much as it is petty larceny.
    I'm not OCD. I'm CDO which is alphabetically correct.

  5. #5

    Join Date
    Jun 1999
    Location
    NE Missouri
    Posts
    328

    Re: An old brassie stereopticon lens

    Quote Originally Posted by John Kasaian View Post
    Breaking news!
    I found another marking
    15 in. EF

    I opened her up and there is one lens (group?) at either end of the long empty barrel.
    Its a very simple looking lens
    If it only has 2 pieces of glass, it isn't a petzval or a triplet as both have 3 pieces of glass. You may have only a partial lens and might need to focus at infinity to see if you really have a 15", usable lens there. You might also want to try just a single element alone if you have a lot of bellows.

    Richard

  6. #6

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    Re: An old brassie stereopticon lens

    Quote Originally Posted by Richard Rankin View Post
    If it only has 2 pieces of glass, it isn't a petzval or a triplet as both have 3 pieces of glass. You may have only a partial lens and might need to focus at infinity to see if you really have a 15", usable lens there. You might also want to try just a single element alone if you have a lot of bellows.

    Richard
    I've only unscrewed the rear element and it is quite thick so it could be a triplet---there are three reflections anyway. It's uncoated, of course.
    I steal time at 1/125th of a second, so I don't consider my photography to be Fine Art as much as it is petty larceny.
    I'm not OCD. I'm CDO which is alphabetically correct.

  7. #7

    Join Date
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    Location
    NE Missouri
    Posts
    328

    Re: An old brassie stereopticon lens

    If there isn't another symmetric glass element between the font and rear, it isn't a triplet. If it is a petzval, turn the rear element over and find the ring that unscrews. If it comes off, there should be the ring you just unscrewed, glass, a metal ring and more glass. That would indicate a petzval.

    Richard

  8. #8

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    Re: An old brassie stereopticon lens

    The rear element is definately made up from two pieces of glass.
    I steal time at 1/125th of a second, so I don't consider my photography to be Fine Art as much as it is petty larceny.
    I'm not OCD. I'm CDO which is alphabetically correct.

  9. #9

    Join Date
    Feb 2006
    Posts
    3,116

    Re: An old brassie stereopticon lens

    Quote Originally Posted by John Kasaian View Post
    I need to find a board to stick this on pronto!
    Imagine, stereo swirlies!
    Don't you need two lenses to make images or view in stereo??
    One man's Mede is another man's Persian.

  10. #10

    Join Date
    Jun 1999
    Location
    NE Missouri
    Posts
    328

    Re: An old brassie stereopticon lens

    Quote Originally Posted by John Kasaian View Post
    The rear element is definately made up from two pieces of glass.
    Should be a petzval then. The elements are often installed incorrectly, so you might want to check Dan's site and check the layout of the glass elements.

    http://www.antiquecameras.net/

    Richard

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