Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,329   Posts: 1,537,177   Online: 832
      
Page 1 of 3 123 LastLast
Results 1 to 10 of 21
  1. #1

    Join Date
    Feb 2004
    Location
    Iowa
    Shooter
    Multi Format
    Posts
    829
    Images
    7

    What's wrong with this lens?

    I just received, today, a 3x4 speed graphic that I bought on ebay. The lens that came with the camera is a Carl Zeiss Jena Tessar 1:4.5 f=15cm. It resides in a dial set compur. When trying to focus the camera, I couldn't get a focused image to show on the ground glass unless I racked it all the way in; to roughly 1.5 inches from the ground glass. What's going on here? The serial # on the front element is 1194375, the back element says 94375. I assume they're a match, but maybe not. Why won't it focus right? I'm clueless. Maybe I should buy Jim's Xenar?

    Thanks for your help,
    Matt

  2. #2

    Join Date
    Sep 2004
    Shooter
    Plastic Cameras
    Posts
    1,298
    If it is a wide angle lens, it will be closer to the film plane. Does the lens have decent coverage?

  3. #3

    Join Date
    Feb 2004
    Location
    Iowa
    Shooter
    Multi Format
    Posts
    829
    Images
    7
    It's a 15cm (or 150mm, or 6") lens, so to focus at infinity the lens should be roughly that distance from the ground glass. It won't show a focused image unless it's about 1.5" from the ground glass. I just don't know why.

  4. #4

    Join Date
    Sep 2002
    Shooter
    Large Format
    Posts
    4,530
    Havew you tried it without the back element? You might have a convertible lens....

  5. #5
    medform-norm's Avatar
    Join Date
    Dec 2004
    Location
    Netherlands
    Shooter
    Multi Format
    Posts
    863
    Images
    1
    Quote Originally Posted by matt miller
    I just received, today, a 3x4 speed graphic that I bought on ebay. The lens that came with the camera is a Carl Zeiss Jena Tessar 1:4.5 f=15cm. It resides in a dial set compur. When trying to focus the camera, I couldn't get a focused image to show on the ground glass unless I racked it all the way in; to roughly 1.5 inches from the ground glass. What's going on here? The serial # on the front element is 1194375, the back element says 94375. I assume they're a match, but maybe not. Why won't it focus right? I'm clueless. Maybe I should buy Jim's Xenar?

    Thanks for your help,
    Matt
    Did someone play around with this lens, took it apart and put it back together in the wrong way? Do all the elements look as if they could be reversed? Could you show some pics of the lens itself if you thought that would help?

  6. #6

    Join Date
    Feb 2004
    Location
    Minnesota Tropics
    Shooter
    Multi Format
    Posts
    735
    Can we see a picture of the camera? The images might still be on ebay. Point us to the item #, please.

  7. #7

    Join Date
    Feb 2004
    Location
    Iowa
    Shooter
    Multi Format
    Posts
    829
    Images
    7
    Quote Originally Posted by jjstafford
    Can we see a picture of the camera? The images might still be on ebay. Point us to the item #, please.
    Here's the ebay listing: http://cgi.ebay.com/ws/eBayISAPI.dll...MEWN%3AIT&rd=1

    I just tried removing the rear element & it didn't change much. I turned the lens around & held it up to the ground glass & that didn't change much either. Could improper spacing cause it to be that far off? I noticed that the rear element is missing 2 numbers compared to the front. Weird.

  8. #8

    Join Date
    Feb 2004
    Location
    Iowa
    Shooter
    Multi Format
    Posts
    829
    Images
    7
    I just wrote the seller & asked him how he knows "the lens is sharp".

  9. #9
    jimgalli's Avatar
    Join Date
    Sep 2002
    Location
    Tonopah Nevada
    Shooter
    ULarge Format
    Posts
    3,401
    Blog Entries
    2
    Images
    155
    You should buy Jim's Xenar

    The front group on that lens can be disassembled for cleaning. All of the elements should face "out". Bowed towards the front of the camera. Maybe someone took it apart for cleaning and reassembled it wrong.
    He is no fool who gives what he cannot keep..to gain that which he cannot lose. Jim Elliot, 1949

    http://tonopahpictures.0catch.com

  10. #10

    Join Date
    Feb 2004
    Location
    Minnesota Tropics
    Shooter
    Multi Format
    Posts
    735
    The reflections on the lens don't look right, but it is hard to see well.

Page 1 of 3 123 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin