Wizard of Wetzlar- Arthur Seibert

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

  1. 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.

    The orginal emoskop has the following engraving on the tube

    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.


    • 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

    • 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

    • 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
    • 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


    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
      • 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. 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. <p> Hence the EmoScop telescope can be focused
    as close as 6". The original Seibert Emoskop close focus to about
    <p> 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. The original Wetzlar-SEIBERT-
    Emoskop may not have a stand, as the Emoskop instruction sheet did
    mention such as stand.
  4. Extending the principle of Emoskop, I tried the following


    <li>Part A+ part B of Emoskop + 22x Peak loup = 66x microscope
    <li>Minox MD6X16 monocular + 50mm/f1.4 Carl Zeiss T* lens = 30x
  5. There is very little information about Arthur Seibert in literature
    and on the web.<p> 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
  6. The magnification of a microscope is the magnification of objective
    multiplied by the magnification of the eyepiece.<p>
    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
    <p> 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. The magnification of two loupes put together is the sum of the
    magnification of each loupe.
    <p> For example, in
    Emoscop loup, the combination of 5x loupe and 10x loupe = 5+10=15x
    <p> This is because the focal length of compound loupe is

    1/F = 1/f1 + 1/f2
    <p> Since the power of loupe is 250/F(mm) therefor
    250/F = 250/f1 + 250/f2
    <p> Or power of compound loupe = sum of power of the loupes
  8. EmoSkop SM
  9. 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.
    <p> Further, for long storage or display, the disassembled Emoscop is
    more likely to get dust into its interior
  10. 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




    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!
  11. A Hong Kong company Emoscop.com now makes Emoscope in an ISO 9002 certified optical instrument company in china
  12. 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
  13. Picture of EMO Seibert Wetzlar Emoskop and Emoscope SM, taken with Minox B on Minox copy stand
  14. 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
  15. Mauro, can you upload a picture of this macro bellow ?
  16. EMO Optik Wetzlar also built Lordon 1:1,9/50mm lens for Lordomat SE 35mm camera of Leidolf Wetzlar.
    Lordomat 35mm camera
  17. 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."
  18. 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
  19. Replace missing images due to site change
    EMO emoskop in box
    One telescope, one loupe
    Loup screw on to telescop = microscope
    Emoscop on stand as microscope
  20. [​IMG]
  21. ph.


    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?
  22. 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.
  23. ph.


    Minox C also came with the Complan lens for a while.
  24. Look at http://www.sfwcf.com/emoscope.jpg for an image of yet another design of the name...
    Dave Gomberg
  25. 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:
  26. 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.
  27. 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).
  28. Miles, My first Emoscop was bought from Haverhill too. I still use it

Share This Page