There's lenses, then there are lenses...

Discussion in 'Digital SLR' started by RichA, Feb 8, 2008.

  1. RichA

    RichA Guest

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  2. RichA

    Buy_Sell Guest

    Buy_Sell, Feb 14, 2008
    #2
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  3. RichA

    Paul Furman Guest

    Closeup only though, right? If you partially disassemble do you think it
    could get closer to infinity focusing?
     
    Paul Furman, Feb 14, 2008
    #3
  4. RichA

    Buy_Sell Guest

    Paul, this lens is from a medical machine found in a metal recycling
    yard. For the purpose that it was designed, it did a wonderful job.
    I paid about 10 cents for the lens and it is nothing more than an
    ornamental piece. I was merely fascinated how one side of the lens
    appears as if hollow all the way thru, yet the opposite side of the
    lens is no bigger than a dime. I have several of these lenses. Metal
    recyclers don't find any value in them because they contain very
    little metal. They are crushed on a daily basis. I often thought of
    building the 'frazier lens' with some of these interesting optics. My
    collection includes prisms and specially coated mirrors, etc. Some of
    the mirrors appear gold from one side but appear like purple glass
    from the other side. I am fascinated by optics but more fascinated by
    what some people throw away. It must have cost a lot of money to
    create some of these optics and they are so easily discarded, crushed
    and returned to the earth when their useful life cycle is completed.
    What a shame... http://www.pbase.com/iwerk/image/69022562
     
    Buy_Sell, Feb 14, 2008
    #4
  5. Cool looking lens. A quick glance at this thread makes me think it can be
    adapted to fit Nikon. If it can be adapted to Nikon than it's no problem
    for a Canon mount. Rooting through scrap can be fun and rewarding. good
    find!

    <http://forums.macrumors.com/showthread.php?t=209666>




    Rita
     
    Rita Berkowitz, Feb 14, 2008
    #5
  6. RichA

    acl Guest

    Could you possibly post there some shots of it from different angles?
    What's the diameter of the rear element? If it's small enough, I'd go
    and get the cheapest used nikon f-mount lens I could find, remove the
    mount and attempt to fit it to the back of this thing (eg glue it!).
    There's no way it'll focus at infinity, but it'll probably focus
    somewhere (very close!).

    Worth a try, if you have the time. Or you could send it to me :)
     
    acl, Feb 14, 2008
    #6
  7. RichA

    Paul Furman Guest

    You can simply focus a macro lens on the back of it as a starting point.
    The image quality suffers, you lose stops & odd vignetting can occur but
    I don't know maybe you'd still see the image as it would look if it were
    f/0.7, or maybe it would just look more stopped down. It might require
    refocusing on ground glass to actually see what f/0.7 looks like. 35mm
    SLR lenses are used on camcorders this way for a shallow focus look with
    an expensive adapter. Pointing it at a bright sky scene and adjusting a
    sheet of tracing paper in back should let you know what the
    flange/sensor distance is and how large the circle.

    Message #8 shows what this kind of lens might produce doing extreme
    closeups of flowers. Here's more:
    http://www.muellerworld.com/exhibits/fast_lens/
     
    Paul Furman, Feb 15, 2008
    #7
  8. RichA

    Paul Furman Guest

    Sometimes you can remove parts to get it closer to the sensor. Don't let
    it hit the mirror though!

    <getting in line for one>
     
    Paul Furman, Feb 15, 2008
    #8
  9. RichA

    Buy_Sell Guest

    I took another photo of a few of these lenses. One side of the lens
    is a nice size but the other side is no bigger than a dime. They were
    all purchased from metal recycling yards for very little money. I
    normally fill a 5 gallon plastic pail with such items and pay a few
    bucks to the workers to buy some lunch. http://www.flickr.com/photos/20556504@N03/show/
     
    Buy_Sell, Feb 15, 2008
    #9
  10. RichA

    BC Guest

    BC, Feb 15, 2008
    #10
  11. Talk about sliver thin DoF!! It looks like it can be a fun lens, but could
    be a real bear to use at times.




    Rita
     
    Rita Berkowitz, Feb 15, 2008
    #11
  12. RichA

    Buy_Sell Guest

    I had no idea of these possibilities. Thanks...
     
    Buy_Sell, Feb 15, 2008
    #12
  13. RichA

    acl Guest

    Cool, thanks. I'm salivating! It's a shame to leave these rotting, try
    to use them!
     
    acl, Feb 15, 2008
    #13
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