Filter size for Turner-Reich Anastigmat Ser. II

Discussion in 'Large Format Cameras and Accessories' started by ntenny, May 28, 2013.

  1. ntenny

    ntenny Member

    Messages:
    2,283
    Joined:
    Mar 5, 2008
    Location:
    San Diego, C
    Shooter:
    Multi Format
    I've acquired a convertible Gundlach T-R Anastigmat Series II---focal lengths 12"/21"/28", f/6.8, labelled for 8x10. This seems to be the No. 5 lens in the series, per a Gundlach catalog at http://www.cameraeccentric.com/html/info/korona_2.html.

    There are filter threads, the diameter seems right for a 55mm filter, but either the diameter is just *slightly* wrong or the thread pitch is different. I can't find anything on the lens that would indicate the diameter. It's certainly bigger than 52mm, and I don't think I've ever heard of a 53mm or 54mm size---or were there once filters in inch sizes, and this should take a 2 1/4" filter (which is what the catalog gives as the diameter of the elements)? It's too early for series filters, right? Or are the threads not for filters at all but for something else?

    Thanks

    -NT
     
  2. E. von Hoegh

    E. von Hoegh Member

    Messages:
    3,925
    Joined:
    Sep 14, 2011
    Location:
    Adirondacks
    Shooter:
    Multi Format
    Series filter with a slip on adapter. The threads you see are not standard filter threads, but you could have someone like S.K. grimes machine an adapter.
     
  3. shutterfinger

    shutterfinger Subscriber

    Messages:
    1,278
    Joined:
    Feb 25, 2013
    Location:
    San Francisco Peninsul
    Shooter:
    4x5 Format
    The threads in the front of lens made up through the 1950's maybe the 1960's are for the front element retaining ring only.
    Filters were made in series sizes IV through IX. Adapter rings for each series size were made in fractional steps for the various different sized lens barrels of the front lens group.
    Series IV- 8mm and 16mm movie cameras
    Series V- 3/4-1 3/16 inch
    Series VI-1 1/4-1 21/32 inch
    Series VII- 1 11/16-2 inch
    Series VIII- 2 1/16-2 5/8 inch

    Measure the outside diameter of the lens front lens barrel and look for a Series filter adapter that the measurement of the lens matches and series filters or as E says have a machinist custom make a threaded adapter. Some series adapters were marked in millimeters so convert the fraction to decimal and multiply by 25.4
     
  4. Jon Shiu

    Jon Shiu Subscriber

    Messages:
    2,814
    Joined:
    Dec 2, 2003
    Location:
    Elk, Califor
    Shooter:
    Plastic Cameras
    Or, you could just glue in at step-up filter adapter ring.

    Jon
     
  5. E. von Hoegh

    E. von Hoegh Member

    Messages:
    3,925
    Joined:
    Sep 14, 2011
    Location:
    Adirondacks
    Shooter:
    Multi Format
    Actually, most of these lenses - and the Turner-Reich specifically, but old Dagors, etc have no retaining ring in front. The threads might have been used during manufacture, for instance to hold the brass cell onto an arbor.
     
  6. John Koehrer

    John Koehrer Subscriber

    Messages:
    6,381
    Joined:
    Apr 3, 2004
    Location:
    Montgomery,
    Shooter:
    Multi Format
    It's also one lens that E. Weston used at one time.

    Doesn't really help, just a bit of trivia.
     
  7. ntenny

    ntenny Member

    Messages:
    2,283
    Joined:
    Mar 5, 2008
    Location:
    San Diego, C
    Shooter:
    Multi Format
    Thanks, everyone. It looks like the threads are the same as the threading between the barrel and the lens cells, so maybe they're some kind of strange artifact of the manufacturing process. I've got some ideas about fabricating a slip-on adapter---paying for custom machining seems like an unnecessary expense unless I end up with a collection of lenses with the same threads.

    -NT