Results 1 to 4 of 4

Thread: Old lens with no name

  1. #1

    Join Date
    Apr 2008
    Jamul, CA

    Old lens with no name

    I recently got a lens/shutter from a friend. I appears to be quite old but works. The shutter is a Kodak Ball Bearing with 3 speeds. The lens has no writing around the front element. The rear element has "5x7 Rapid Rectilinear" on the side of the barrel. Any idea what the age and focal length are? It covers 4x5 with movements and appears to be very sharp.

  2. #2

    Join Date
    Aug 2006
    Milford Pa.

    Re: Old lens with no name

    photos would help.

    measure from the iris to the ground glass to get a very close approximation of the FL. probably a 7 inch lens. it may convert as well. try it.
    My YouTube Channel has many interesting videos on Soft Focus Lenses and Wood Cameras. Check it out.

    My YouTube videos gallery

  3. #3

    Join Date
    Oct 2004
    S.W. Wyoming

    Re: Old lens with no name

    It's a Bausch & Lomb Rapid Rectilinear. The aperture scale will show it as an f/4 lens, but that is the old US system. It's actually an f/8. To get modern f/ stop settings, just remember f/16 is f/16 and count up or down in modern progression. Extremely sharp lens in the center, with rapid fall off in the corners and edges. 5X7 means it came off an old self casing plate camera from the late 19th or early 20th century, ala Premo, Seneca, et al.
    Fun to use but those shutters are rarely even close. Pretty crappy actually. I've had good luck getting 1/25 out of at least one speed.
    I should mention that using this lens on 4X5 will keep the image more within the range of shapness. That, to me, is the secret to using these things.

  4. #4

    Join Date
    Apr 2008
    Jamul, CA

    Re: Old lens with no name

    It does have US stops and I have a conversion table. You're right about the shutter. It seems to be the same speed no matter what is selected. I did a little searching last night and it looks like it might be from a Seneca from around 1915. I'm going to set it up on my Crown View today and get an approximate FL.
    Thanks for the replies so far.

Similar Threads

  1. lens hood
    By epack in forum Cameras & Camera Accessories
    Replies: 66
    Last Post: 22-Dec-2008, 21:26
  2. Can bellows "stretch" lens?
    By Ken Grooms in forum Cameras & Camera Accessories
    Replies: 19
    Last Post: 25-Oct-2006, 19:35
  3. When to switch to a macro lens?
    By William Mortensen in forum Lenses & Lens Accessories
    Replies: 32
    Last Post: 22-Jun-2006, 08:46
  4. Picking ideal lens and fl, for flat copy work
    By bglick in forum Lenses & Lens Accessories
    Replies: 21
    Last Post: 8-Feb-2006, 21:49
  5. How to picture an enlarging lens in practice?
    By John D Gerndt in forum Darkroom: Film, Processing & Printing
    Replies: 6
    Last Post: 2-Jan-2004, 11:52


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts