Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 71,946   Posts: 1,585,889   Online: 1061
      
Page 1 of 3 123 LastLast
Results 1 to 10 of 30
  1. #1

    Join Date
    Mar 2011
    Shooter
    Large Format
    Posts
    96

    Help Please! 14" Goerz Apochromat Artar will not focus

    Help!
    I bought a 14" Goerz Apochromat Artar off eBay,
    Glass is clear, but it will not focus!
    It looks like it is starting to focus on infinity at about 5", but my 8x10 will not go any smaller.
    My guess is the glass was cleaned and assembled incorrectly - but I have tried variations and still no luck.
    Any ideas?
    Does anyone have a picture of the lens formula so that I can check to see if I am missing an element?

  2. #2
    shutterfinger's Avatar
    Join Date
    Feb 2013
    Location
    Mid Peninsula, Ca.
    Shooter
    4x5 Format
    Posts
    577

  3. #3
    LJH
    LJH is offline

    Join Date
    Nov 2008
    Location
    Australia
    Shooter
    ULarge Format
    Posts
    610
    What's it look like when you extend to 14" (or more)?

    5" is way too short to render anything remotely close to being in focus.

  4. #4

    Join Date
    Mar 2011
    Shooter
    Large Format
    Posts
    96
    Quote Originally Posted by LJH View Post
    What's it look like when you extend to 14" (or more)?

    5" is way too short to render anything remotely close to being in focus.
    Nothing at all abut blur at 14", extending out - still blurry - only less blurry when close in...

  5. #5
    ic-racer's Avatar
    Join Date
    Feb 2007
    Location
    Midwest USA
    Shooter
    Multi Format
    Posts
    6,396
    Does that lens cover 8x10 anyway? I'd send it back.

  6. #6

    Join Date
    Mar 2011
    Shooter
    Large Format
    Posts
    96
    Quote Originally Posted by shutterfinger View Post
    Excellent link - thanks!
    According to documentation, the lens should be:
    Convex - concave - shutter - Concave Convex

    () )( S )( ()

    Instead the lens came

    Convex - Shutter - Concave - Convex - Concave

    () S )( () )(

    easy to change as it screws apart.

    Lens now focuses!!

    Thanks again!!

  7. #7

    Join Date
    Sep 2011
    Location
    Adirondacks
    Shooter
    Multi Format
    Posts
    3,686
    Quote Originally Posted by mkillmer View Post
    Excellent link - thanks!
    According to documentation, the lens should be:
    Convex - concave - shutter - Concave Convex

    () )( S )( ()

    Instead the lens came

    Convex - Shutter - Concave - Convex - Concave

    () S )( () )(

    easy to change as it screws apart.

    Lens now focuses!!

    Thanks again!!
    Send it back. It doesn't cover 8x10 sharply, and you don't know what else is screwed up - my guess is plenty.

  8. #8
    LJH
    LJH is offline

    Join Date
    Nov 2008
    Location
    Australia
    Shooter
    ULarge Format
    Posts
    610
    Quote Originally Posted by E. von Hoegh View Post
    Send it back. It doesn't cover 8x10 sharply, and you don't know what else is screwed up - my guess is plenty.
    Quote Originally Posted by mkillmer

    "Lens now focuses!!"
    Seems your guess was incorrect...

  9. #9

    Join Date
    Mar 2005
    Shooter
    Multi Format
    Posts
    3,581
    Quote Originally Posted by LJH View Post
    Seems your guess was incorrect...
    Per Goerz, the 14 inch Artar covers 14 x 17 at 1:1, i.e., 7 x 8.5 at infinity. 7 x 8.5 seems smaller than 8 x 10.

    Its hard to imagine how the lens was screwed together as the OP reported. Its unusual for individual elements' mounts to be threaded so that assembly as described by the OP reported is possible. I believe him, am puzzled.

    The lens isn't fit for its intended purpose and its condition is unknown and suspect until proven otherwise. 16.5"/9.5 Artars aren't rare and will do what the OP needs. They can even be put in shutter..

  10. #10

    Join Date
    May 2013
    Location
    US
    Shooter
    Large Format
    Posts
    2,060
    I'd have sent it back. Somebody's been fooling with it, Might be full of fake glass. Who knows what?

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