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Wizard of Wetzlar- Arthur Seibert

Martin Tai , Apr 16, 2000; 01:40 p.m.

emoscope

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
  • 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



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.


Responses


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Martin Tai , Apr 21, 2000; 10:43 a.m.

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 8". <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"

Martin Tai , Apr 21, 2000; 10:54 a.m.

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

Martin Tai , Apr 23, 2000; 06:41 a.m.

Extending the principle of Emoskop, I tried the following combination<ol>

<p>

<li>Part A+ part B of Emoskop + 22x Peak loup = 66x microscope <li>Minox MD6X16 monocular + 50mm/f1.4 Carl Zeiss T* lens = 30x microscope.

Martin Tai , Apr 28, 2000; 07:38 p.m.

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 EMO-Optik.

Martin Tai , Apr 29, 2000; 06:48 a.m.

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

Martin Tai , Apr 29, 2000; 06:49 a.m.

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 loupe. <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

Martin Tai , May 02, 2000; 09:51 a.m.

Martin Tai , May 02, 2000; 11:35 a.m.

Martin Tai , May 02, 2000; 11:47 a.m.

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


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