Wizard of Wetzlar- Arthur Seibert

Discussion in 'Minox' started by mtc photography, Apr 16, 2000.

  1. MTC  Photography

    MTC Photography Moderator

    Wizard of Wetzlar - Arthur Seibert
    .
    Arthur Seibert
    ( 1906- 1980) was Ernst Leitz lens designer from 1920 to 1947. In 1948 Seibert left Leitz and undertook the task of designing a subminature lens for Minox camera .
    Arthur Seibert was a great optics designer, his most famous designs were the five element Pentar lens of Minox II and the COMPLAN lens for Minox III/IIIs/B, and early Minox C. The Pentar and COMPLAN are still two of the sharpest subminature lenses-- in fact the sharpest of any commercial photographic lenses
    In 1951, Arthur Seibert formed his own optik company

    EMO-OPTIK Arthur Seibert emo Wetzlar West Germany Werk fur Elektronik und Optik Hornsheim Eck 11 35524 Wetzlar Germany 49/6441/72044



    • Many of EMO's products are masterpieces of optical design, for example
    • Highly corrected EMO Wetzlar 5x Macromax loup
    • Emoskop : this marvel is a telescope, a microscope and three loups all in a 2" tube.
    • Octoskop : A combination loup with eight magnifications: 2x 4x 6x 10 x 14x 18x 20x 28 x .
    emoskop Emoskop is a combination of telescope, microscope and magnifier in a pocket package.

    • It is the optical equivalent of a Swiss Army knife.

    EMO SEIBERT EMOSKOP
    The orginal emoskop has the following engraving on the tube


    \||||||||||||||||||
    EMO
    SEIBERT
    Wetzlar/Germany
    EMO-SEIBERT emoskop
    The top end of the eyepiece has a milled band; the bottom of emoskop has two engraved chrome rings.
    The small black leather case fits the emoskop without the stand.
    The original EMO Seibert emoskop is the prettiest. It is also scarce.
    The Emoskop is made of metal , very compact, when assembled in to a microscope, it ss about 21mm in diameter and 42 mm long.


    ) () ()
    A B C


    Emoskop consists of three lenses. Lens A,B,C each has its own housing




    • Lens A is a cemented two element achromatic lens of negative power , it is the the eye piece of telescope and microscope. Lens A is mounted at one end of a tube, which goes into lens B tube.



    )(
    Eyepiece
    LOUP

    • Lens B lens is a cemented two element achromat mounted at one end of outer tube. Lens B can be used by itself as a 5x loup

    ()
    part B: 5 x loup
    • Lens C is another cemented two element lens of 10x power . Lens C can be used as a 10x loupe

      by itself.

    ()


    Part C: 10 x loup
    • Lens B and lens C combines into a 15 x loup


    ()
    ()
    B + C = 15x loup
    Great for examine Minox 8x11 negative
    TELESCOPE

    • Eyepiece A and lens B together makes a 3x telescope


    )( ()
    A + B = telescope
    This telescope is only 3 cm long can be held with two fingers-- the smallest telescope ever made.
    One interesting property of this tiny telescope is its focuses as close as 8". Not many regular telescope

    can focus that close.
    The following are some use for this vest pocket telescope
      • Examine object under lathe at an arm's length safe distance
      • Look at menu or newspaper at next table.
      • Check title on top shelf in book store or library
      • Look at the details of camera in display case behind the counter
    MICROSCOPE (25-30 X)

    • All three lenses together make a 25x to 30 x microscope

    )( () ()
    A + B+ C= microscope
      • Ideal for examination of Minox 8x11 negative
      • Examine fine details of stamp
      • Check out bogus money--- with this very sharp microscope, finest details in paper money will be
      revealed in great sharpness, it is easy to distinguish bogus money from real
      • Examine diamond and gem
      • Examine micro-mount crystals
      • Examine fine detail of yarn, silk and fabrics.
        • Examine the dpi of printed picture in book/magazine
      • Examie small insect
    Emoskop microscope has a great advantage over ordinary high power loup----- greater working
    distance. For example with a 22 x Peak loup, the working distance from the loupe to the a stamp is less than 10 mm; because the lens is too close to the object, it blocks light, and the object appears dim. This short working distance may be not relevant for viweing negatives or transparancies, but is important in examination of opaque objects, such as stamp, paper money, tiny mineral crystals from micromount etc.
    Emoskop in microscope mode has a working distance of 24mm, and the object appears brighter then any loupe

    SPECIFICATION
    • Metal construction
    • Five coated glass elements in three group
    • Flat field achromatic
    • Length
    • Full length 42mm
    • Microscope : working distance : 24mm (from front to object)
      • 25x : 42mm
      • 30x : 57mm
    • Telescope 2.5x/teleloupe 3x
      • Infinity : 34mm
      • 30cm : 50mm
    • Loup
      • 5x 25 mm
      • 10 x 9 mm
      • 15 x 32 mm
    • Diameter 21 mm
    • Weight 28 g
    • Genuine black leather case to hold assembled Emoskop (microscope) and the stand.
    • Anodize aluminium body

    Variations of EMOSKOP
    Wetzlar EMO EMOSCOP SM


    emo Scop SM



    Wetzlar emo Germany
    [​IMG]
    • No milled band on top
    • No chrome ring at bottom
    • Macrolon body
    • Larger leather case to fit both emoskop and stand
    Saunders EmoScop
    In the 70s, Sauders Co in Rochester imported Emoskop and marketed it under the name EmoScop


    [​IMG]

    Emo
    Scop
    SM
    SAUNDERS Rochester
    Saunders EmoScop

    • Difference between emo Emoscop and Saunders EmoScop:
      • There is no "Wetzlar EMO Germany" on Saunders EmoScop, although it was made by EMO
      Wetzlar.
      • Sauders EmoScop stand is a full cylinder, EMOSCOP stand is a cylinder with a quarter cut off for
      more light
      • Saunder box has three slots: one for assembled Emoscop, one for acrylic stand and one for leather case
      • emo emoscop has five slots: three places for the three lenses separately, one slot for stand one for leather case
    Haverhills Episcope
    The Emoskop was originally made in Germany by EMO-Optik. The production of Emoskop was
    discontinued a few years ago. According to a dealer in New Zealand, he saw the Emoskop at
    Photokina at late 198x, and imported it to New Zealand for distribution.
    New Emoskops are still being sold ( by stores specialized in loup, stamp, or fabric and yarn )
    Haverhills in USA has a Emoskop clone made in China, and sold under Haverhills' own trade mark as Haverhills Episcope TM
    The workmanship of Episcope is excellent: anodized metal tubes are well made, with nice decorative
    milled ring on eyepiece and inlaid chrome ring on the 10x loup. Actually the Episcope looks very close to
    the original metal Seibert emoskop, with milled band and chrome ring accent.
    Optically the Havershill Episcope performs quite well, the images of loups, telescope and microscope are
    crisp and bright, without color fringing. I compare the Episcope vs the original EMO-Seibert emoskop in
    telescope/loup/and microscope mode, and do not see any difference in performance.
     
  2. MTC  Photography

    MTC Photography Moderator

    The EMO Wetzlar EmoScop is made of macrolon, it has one advantage over the metal Seibert-Emoskop: in telescope mode, the inner tube of EmoScop has a internal groove such that the eyepiece tube cannot be pull out without squeezing the tube, unlike the Emoskop the inner tube can be pull apart easily.
    Hence the EmoScop telescope can be focused as close as 6". The original Seibert Emoskop close focus to about 8".
    In Havershill website, it says that Episcope/telscope can focus close to 6", that is incorrect. Episcope/telescope's closest range is about 12"
     
  3. MTC  Photography

    MTC Photography Moderator

    The original Wetzlar-SEIBERT- Emoskop may not have a stand, as the Emoskop instruction sheet did not mention such as stand.
     
  4. MTC  Photography

    MTC Photography Moderator

    Extending the principle of Emoskop, I tried the following combination
      • Part A+ part B of Emoskop + 22x Peak loup = 66x microscope
      • Minox MD6X16 monocular + 50mm/f1.4 Carl Zeiss T* lens = 30x microscope.
     
  5. MTC  Photography

    MTC Photography Moderator

    There is very little information about Arthur Seibert in literature and on the web.
    The best source so far is Morris Moses and John Wade: Spycamera the Minox Story chapter 4: The Early Postwar Period. There is a portrait of Arthur Seibert, a diagram of Pentar lens of Minox II, the COMPLAN lens, and information about EMO-Optik.
     
  6. MTC  Photography

    MTC Photography Moderator

    The magnification of a microscope is the magnification of objective multiplied by the magnification of the eyepiece.
    In case of Emoscop in microscope mode, the objective has 10x magnification, and the 'eyepiece' is a telescope of 2.5 to 3 x power
    Hence the magnification of the Emoscop in microscope mode is from 25 to 30, being the product of 2.5x10 and 3 x 10
     
  7. MTC  Photography

    MTC Photography Moderator

    The magnification of two loupes put together is the sum of the magnification of each loupe.
    For example, in Emoscop loup, the combination of 5x loupe and 10x loupe = 5+10=15x loupe.
    This is because the focal length of compound loupe is 1/F = 1/f1 + 1/f2
    Since the power of loupe is 250/F(mm) therefor 250/F = 250/f1 + 250/f2
    Or power of compound loupe = sum of power of the loupes
     
  8. MTC  Photography

    MTC Photography Moderator

    EmoSkop SM
     
  9. MTC  Photography

    MTC Photography Moderator

  10. MTC  Photography

    MTC Photography Moderator

    IMO, the three slot EmoScop box is better than the five slot box; because, after use, you don't have to disassamble the EmoSkop into three separate pieces and store them separately, you can put the whole Emosop in one slot.
    Further, for long storage or display, the disassembled Emoscop is more likely to get dust into its interior
     
  11. Haverhill's apparently imported an EMO from Germany before they started with the Asian clones; I have one that has the chrome milling and bands of the original EMO, and in the middle the words
    A. SEIBERT Wetzlar/Germany haverhill's
    engraved in the barrel. It didn't come with the plastic stand, but did come with a fitted leather case. I got it new some 35 years ago. Still have it, still use it!
     
  12. MTC  Photography

    MTC Photography Moderator

    A Hong Kong company Emoscop.com now makes Emoscope in an ISO 9002 certified optical instrument company in china
    Emoscop.com
     
  13. Haverhill's Episcope was, at least for awhile, made in Japan. The website mentions only Chinese manufacture. My Episcope, bought from Haverhill's 10-15 years ago, bears a logo of the Japanese company, "NG." I'll be happy to provide photos showing that logo & the Episcope itself if you'll Email me
     
  14. MTC  Photography

    MTC Photography Moderator

  15. MTC  Photography

    MTC Photography Moderator

  16. MTC  Photography

    MTC Photography Moderator

    Picture of EMO Seibert Wetzlar Emoskop and Emoscope SM, taken with Minox B on Minox copy stand
    003XuE-8890484.jpg
     
  17. MTC  Photography

    MTC Photography Moderator

  18. MTC  Photography

    MTC Photography Moderator

  19. I own a macro bellow for voigtlander bessamatic signed Artur Seibert Wetzlar; it is a fine piece of mechanics and optics. Could anyone giving me further informations on it? Thanks in advance
     
  20. MTC  Photography

    MTC Photography Moderator

    Mauro, can you upload a picture of this macro bellow ?
     
  21. MTC  Photography

    MTC Photography Moderator

    EMO Optik Wetzlar also built Lordon 1:1,9/50mm lens for Lordomat SE 35mm camera of Leidolf Wetzlar.
    Lordomat 35mm camera
     
  22. You wrote that Haverhill's Episcope is made in China. I own an Episcope I bought at Haverhill's some 20+ years ago & it is marked "Japan."
     
  23. MTC  Photography

    MTC Photography Moderator

    Bruce, Havershill episcope was once upon a time made in Japan, later made in China.
    Emoscop was made in Germany, now also made in China
     
  24. MTC  Photography

    MTC Photography Moderator

    Replace missing images due to site change
    [​IMG]
    EMO emoskop in box
    [​IMG]
    [​IMG]
    One telescope, one loupe
    [​IMG]
    Loup screw on to telescop = microscope
    [​IMG]
    Emoscop on stand as microscope
     
  25. MTC  Photography

    MTC Photography Moderator

    [​IMG]
    Original SEIBERT EMOSCKOP
    [​IMG]
     
  26. not only the eye of the minox I believe, the lens of the film camera Dralowid is marked "minox wetzlar, 12,5mm f 2.5. Siebert at work?
    p.
     
  27. MTC  Photography

    MTC Photography Moderator

    p
    Dralowid Reporter 8mm filmcamera made by Steatit Magnesia AG in Germany has a Minox Wetzlar Dralonar 12.5mm f2.5 lens. Facts are scant. My guess is that it could be the design of Seibert; In Minox 8x11mm subminiature camera
    Minox IIIs, Minox B has Seibert designed COMPLAN lens. After Seibert left Minox, the subsequent Minox subminiature camera such as Minox LX has MINOX lens, instead of special lens. Since Dralowid Reporter has lens called "Dralonar" , in the tradition of COMPLAN, it is quite possible it was a Seibert lens.
     
  28. Minox C also came with the Complan lens for a while.
    p.
     
  29. Look at http://www.sfwcf.com/emoscope.jpg for an image of yet another design of the name...
    Dave Gomberg
     
  30. Post ing on this forum is next to impossible for me.
    The scope in the above image was bought direct from Emo Wetzlar in the mid 1960's:
    00cxel-552603684.jpg
     
  31. Thanks Dave. I had never seen Martin's effort about this, and congratulate him on spending many hours assembling the above information for our education.
    What a marvel of ingenuity it is.
     
  32. Here is an ad for Haverhill's Episcope from the March/April 1998 issue of Mother Jones Magazine. As you can see, they were still made in Japan, and sold for $69.95 instead of today's (2016) price of $59.95. I ordered one today from Haverhills ( http://www.haverhills.com/cgi-bin/store.cgi?&shop=city&L=eng&P=1062 ), and asked customer service about the case, which they confirmed to be leatherette, not leather (in case anyone else is wondering).
     
  33. MTC  Photography

    MTC Photography Moderator

  34. MTC  Photography

    MTC Photography Moderator

    Miles, My first Emoscop was bought from Haverhill too. I still use it
     

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