Results 1 to 6 of 6

Thread: Docter Wetzlar APO Germinar 240mm F9 Filter thread question

  1. #1

    Join Date
    Jul 2001
    Location
    Robin Hoods Bay / Yorkshire Dales
    Posts
    146

    Docter Wetzlar APO Germinar 240mm F9 Filter thread question

    I have bought a 240mm F9 APO Germinar lens marked Docter Wetzlar. It is not the W version. Done the internet searches and the filter thread is not that indicated in the reference articles on these lenses (says it should be 40.5mm). It is in a copal 1, has a 37mm push cap. Internal measurement to the threads is between 35 & 36mm, to the internal edge of the barrel (excluding the thread) is 36mm. I speculate that the stepping ring I need is 35.5mm - anyone help ?

    Thanks

    Dave

  2. #2
    Big Bend
    Join Date
    Dec 2005
    Location
    San Antonio, Texas
    Posts
    367

    Re: Docter Wetzlar APO Germinar 240mm F9 Filter thread question

    well I can't find any reference of a 240/9 with 35.5 filter threads, however, 35.5mm is a spec for filter thread on the 150/9-W, and the 105/4.5 tessar.
    I would tend to trust your measurement in this case.

  3. #3

    Join Date
    Jul 2001
    Location
    Robin Hoods Bay / Yorkshire Dales
    Posts
    146

    Re: Docter Wetzlar APO Germinar 240mm F9 Filter thread question

    Thanks Joe, I can t find any reference either. It was from Mr Cad originally from when the factory closed down.

  4. #4
    Do or do not. There is no try.
    Join Date
    Jan 2007
    Location
    Massachusetts, USA
    Posts
    865

    Re: Docter Wetzlar APO Germinar 240mm F9 Filter thread question

    You might ask Arne Croell if he knows anything about it. You can send him a PM through the forum. He's a member and occasionally posts here, but I don't know how often he visits so he might not see your question for some time.

  5. #5
    the Docter is in Arne Croell's Avatar
    Join Date
    Dec 1997
    Location
    Huntsville, AL
    Posts
    1,205

    Re: Docter Wetzlar APO Germinar 240mm F9 Filter thread question

    Thanks for bringing that to my attention - the 40.5mm in my tables came from the original Docter leaflets, but I have one myself which I just checked. It is 35.5mm, same as yours, and the cap is 37mm. Apparently a typo or copy/paste problem in the Docter literature, and my fault that I never checked the lens itself - I only checked the weight numbers when I got it. I'll correct it in the table on my web site.

    Arne Croell

  6. #6

    Join Date
    Jul 2001
    Location
    Robin Hoods Bay / Yorkshire Dales
    Posts
    146

    Re: Docter Wetzlar APO Germinar 240mm F9 Filter thread question

    Thanks Arne, slightly relieved as I was worried about the differences esp as it looked the same as the picture in your paper.

Bookmarks

Posting Permissions

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