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Thread: ROSS Symmetrical F16 ANGLE?

  1. #1

    Join Date
    Aug 2008
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    43

    Question ROSS Symmetrical F16 ANGLE?

    Does anyone know ROSS Symmetrical(protable) f16 angle? 75? 90? or 100?
    Thanks.

  2. #2

    Join Date
    Jan 2009
    Location
    Denmark
    Posts
    5,557

    Re: ROSS Symmetrical F16 ANGLE?

    There two F16's from Ross ( apart from the licensed Zeiss and Goertz lenses).

    The "portable" is a a standard RR - scaled down in size to be ....... portable!

    The other is a wide RR - but not that wide, I think.

    Deciding which is which is a real problem as the size numbers and the focal lengths are very similar, if not identical!

  3. #3

    Join Date
    Apr 2012
    Location
    Australia
    Posts
    77

    Re: ROSS Symmetrical F16 ANGLE?

    Hi Sean,

    Below is a catalog page of Ross portable symmetrical lens. It is a pretty old one because it only existed in Ross catalog till 189x.
    The 8" focus length one can cover 8x10 so it should be a 80-degree lens.
    Attached Thumbnails Attached Thumbnails WeChat Image_20171128093530.jpg  

  4. #4

    Join Date
    Aug 2008
    Posts
    43

    Re: ROSS Symmetrical F16 ANGLE?

    Quote Originally Posted by Steven Tribe View Post
    There two F16's from Ross ( apart from the licensed Zeiss and Goertz lenses).

    The "portable" is a a standard RR - scaled down in size to be ....... portable!

    The other is a wide RR - but not that wide, I think.

    Deciding which is which is a real problem as the size numbers and the focal lengths are very similar, if not identical!

    Thank you , the portable is portable, hahaha

  5. #5

    Join Date
    Aug 2008
    Posts
    43

    Re: ROSS Symmetrical F16 ANGLE?

    Quote Originally Posted by lucaas View Post
    Hi Sean,

    Below is a catalog page of Ross portable symmetrical lens. It is a pretty old one because it only existed in Ross catalog till 189x.
    The 8" focus length one can cover 8x10 so it should be a 80-degree lens.
    lucaas, thank you, this catalog is very useful.
    I have no.3 and no.7, as my imprecise measurement, the "light circle" is about 95-100 degree, so in actual use might 80-90 degree.

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