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Thread: Bausch & Lomb 506mm 5.6 / lens coverage for 16x20

  1. #1

    Join Date
    Mar 2019
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    19

    Bausch & Lomb 506mm 5.6 / lens coverage for 16x20

    Dear kind members,

    Im new into ULF and want to build my own camera. i owned a Bausch & Lomb 506mm 5.6 20 inch lens.

    Can you please help me to find out if i can use it on a 16x20 camera?

  2. #2

    Join Date
    Jul 2006
    Location
    Collinsville, CT USA
    Posts
    1,365

    Re: Bausch & Lomb 506mm 5.6 / lens coverage for 16x20

    Can you post an image of the lens and an image of the lettering on the front of the lens?

  3. #3

    Join Date
    Dec 2001
    Location
    NJ
    Posts
    7,568

    Re: Bausch & Lomb 506mm 5.6 / lens coverage for 16x20

    Probably not.

    My USAF lens data sheets are incomplete. They show one 20"/5.6 B&L lens, a very conventional telephoto lens that is around 13.5 inches long and weighs 10 pounds . It covers 35 mm (24 x 36 mm).

    This may well not be the lens you're thinking about, so more information on it would be very helpful.

    They also mention but give no data on other 20"/5.6 lenses including one that covers 5" x 5" and none that cover more.

    The largest format that USAF regularly used was 9" x 18". Their lenses for that format were quite heavy, and 9x18 is considerably smaller than 16x20.

    People have often asked about lenses for ULF here. The short answer is that there are few normal lenses for 16x20. Process lenses that cover the format are all longer than normal.

    For access to my USAF datasheets and to other information about lenses that might, perhaps, do follow the link in the first post in https://www.largeformatphotography.i...mainly)-lenses

  4. #4

    Join Date
    Mar 2019
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    19

    Re: Bausch & Lomb 506mm 5.6 / lens coverage for 16x20

    Quote Originally Posted by Greg View Post
    Can you post an image of the lens and an image of the lettering on the front of the lens?
    Click image for larger version. 

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  5. #5

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    NJ
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    Re: Bausch & Lomb 506mm 5.6 / lens coverage for 16x20

    A telephoto lens and not a USAF lens. Telephotos are all narrow angle lenses, it won't do what you want.

  6. #6

    Join Date
    Mar 2019
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    19

    Re: Bausch & Lomb 506mm 5.6 / lens coverage for 16x20

    Quote Originally Posted by Dan Fromm View Post
    A telephoto lens and not a USAF lens. Telephotos are all narrow angle lenses, it won't do what you want.
    thanks a lot... now i need to sell it...

    Will those do their job?

    Zeiss Apochromat Tessar 10/640mm

    Rodenstock Apo-Ronar 600mm 24in. f/9

  7. #7

    Join Date
    Mar 2019
    Posts
    19

    Re: Bausch & Lomb 506mm 5.6 / lens coverage for 16x20

    And then i have another small question

    maybe it sounds dumb...

    Do i really need a 5.6 lens?

    i think f10 on a 16x20 could generate a DOF of a 1.4 on fullframe?

    Am i right?

  8. #8

    Join Date
    Dec 2001
    Location
    NJ
    Posts
    7,568

    Re: Bausch & Lomb 506mm 5.6 / lens coverage for 16x20

    Quote Originally Posted by maxi0909 View Post
    thanks a lot... now i need to sell it...

    Will those do their job?

    Zeiss Apochromat Tessar 10/640mm

    Rodenstock Apo-Ronar 600mm 24in. f/9
    No and no. I gave you directions to a link that will get you nearly all of the lens catalogs etc. available on line. Use it. Its time to stop dreaming and do your own legwork.

  9. #9

    Join Date
    Mar 2019
    Posts
    19

    Re: Bausch & Lomb 506mm 5.6 / lens coverage for 16x20

    But why? I read that both of those lenses where used by some people for 16x20

    The Zeiss was also used on a 20x25 format camera

    So why do you think it will don't work?

  10. #10

    Join Date
    Sep 2007
    Location
    AZ
    Posts
    4,181

    Re: Bausch & Lomb 506mm 5.6 / lens coverage for 16x20

    Why did you ask here, if you read it would work? Simply trust what you "read", and buy one and see.

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