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Thread: Metrogon-what means serial number? (DF SF XF KF RF)

  1. #1

    Join Date
    Oct 2011
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    Metrogon-what means serial number? (DF SF XF KF RF)

    Hi,
    What means SF, KF, DF and XF in the serial numbers of metrogon lenses (Bausch & Lomb the 1940īs 1950īs aerial camera)?.

    Any patent, the cones?

    Example-RF5640, SF322, XF2231 ...

    A book or paper to find?

    Thanks

  2. #2

    Join Date
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    Re: Metrogon-what means serial number? (DF SF XF KF RF)

    Have you googled? A coupla years ago there was a website about metrogon stuff. How about Google Patent Search? I'll see if I saved such in the pile of electrons in the bottom of my computer

  3. #3

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    Re: Metrogon-what means serial number? (DF SF XF KF RF)

    I no longer had a url, but a google turned this, and wiki- etc.
    http://www.metrogon.20megsfree.com/

  4. #4

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    Re: Metrogon-what means serial number? (DF SF XF KF RF)

    I saw this URL and asked the webmanager. I read the patent 2031792, asked the USGS, wiki, google, surfing, Fairchild T-11 repair camera manual, Manual of Photogrammetry 1st Ed , JOSA,etc.
    I've been looking for a few weeks but nothing
    Last edited by fbascona; 1-Dec-2011 at 09:35. Reason: lapsus

  5. #5

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    Re: Metrogon-what means serial number? (DF SF XF KF RF)

    Here is a URL for B&L date codes: http://forum.mflenses.com/bausch-and...me-t20524.html

    I think that the information in it is false. Use it at your own risk.

    Use your Metrogons at your own risk too.

  6. #6

    Join Date
    Oct 2011
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    Re: Metrogon-what means serial number? (DF SF XF KF RF)

    Quote Originally Posted by Dan Fromm View Post
    Here is a URL for B&L date codes: http://forum.mflenses.com/bausch-and...me-t20524.html

    I think that the information in it is false. Use it at your own risk.

    Use your Metrogons at your own risk too.
    Hi, I checked the schema code with 1035 lenses in a T-11 camera . From them I have a list with the calibration date (1951-1954). The data list is in agreement with the schema code.

    Following, the first letter lens and their date calibration, extract from the list

    SF242 2/26/51
    KF252 12/17/51
    XF258 10/18/52
    DF 3762 2/19/54
    RF145 8/15/54

    1951, all lenses are SF and KF
    1952, iden KF and XF
    ...
    ....

    I think assambled process in the camera during 1 or 1.5 year, the calibrate date is the final process on camera manufacturer.

    For the number I donīt checked it but perhaps it is the supose is correct. The user (kds315) donīt give any reference or source

    Thanks
    Last edited by fbascona; 2-Dec-2011 at 02:56. Reason: my bad english

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