telescope (26)

Solar observation with Merz 75mm from 1890

Observed the Sun the Merz 75mm refractor, equatorial mounted.
This telescope dates from the 1890's.
Used the original Merz eyepieces. Simple Huygens eyepieces but from very good quality.
Nice sharp and contrast views. Lot's of details in the sun spots.


This is an impressive 19th century German telescope.  Used this telescope several times and I'm impressed with the optics and the mechanics of the equatorial mount.

Georg Merz d. 12 January 1867, left business to sons Sigmund & Ludwig.  S. Merz becomes director, used engraved names ''G. & S. Merz vormalsUtzschneider und Fraunhofer’ and ‘G. & S. Merz’. 1871, 63 employees at Merz.

The Merz 75mm refractor is a one of a kind telescope.  The lens with a diameter of 75mm is for it's time large.  The equatorial mount on a woorden tripod is a beauty.

Included in the sale
G. u S. Merz 75 mm f:12refractor
Equatorial metal mount and wooden tripod.
Original finderscope with 15mm crosshair eyepiece and metal lenshood
6 Merz eyepieces: 40mm, 20mm, 15mm, 14mm, 6mm, 5mm
Original star diagonal
Eyepiece adapter
solar filter for the eyepieces
Metal lens hood

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Early A. Bardou 4" Table mount refractor

Last weekend found in a French castle this A. Bardou 4" table mount telescope.
It has the old, small stamp and an unusual tube ring with 2 large screws.

The lens is in fair condition and needs to be cleaned. According to the owner it was bought in the mid 19th century.
The tube needs to be cleaned.  I want polish it. Just clean it.

What makes this find more interesting is the case with the accessories.  A large number of eyepieces, filters, draw tubes, zenith prism, diaphragms, finder scope and a spectroscope.

It also has the typical elevation and locking strut.

Unfortunately the small brass screws to attach it are missing.

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Carl Zeiss Jena Spiegelobjektiv 1000mm f/5.6

The 1000 Spiegelobjektiv (mirror lens) was manufactured always in a Pentacon Six mount with appropriate35mm mount adaptor included ( M42, Exakta, & Praktina ).

This is one of the mythical lenses made by Carl Zeiss Jena with a fantastic finishing.  Mechanical and optical a masterpiece.

Tested the Spiegelobjektiv with a Sony Alpha 7S and it's an excellent lens.  Also for astrophotography

More information on the Anamorfose website

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Lens diameter 60mm tube 65mm length 89cm.
1 terrestrial eyepiece that can be removed.
Internal focuser with one knob.

Boucart Opticien Fabricant à Paris, 35 quai de l'Horloge
Boucart started activities as optician in Paris in 1790. The company was specialized in microscopes but they also sold telescopes.

In 1820 Boucart was taken over by Kuivert Opticien, Paris. See the inventory of the Nachet Collection, 1929
Boucart isn't longer mentioned in the catalog of "L'industrie Française des Instruments de Précision" from 1901 - 1902

More information on the Anamorfose website

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Rare Steinheil large zenith prism for refractors.
Steinheil was one of the most famous European telescope brands from the 19th century.

The zenith prism is a rare accessory.  Also the size is rare.  It's probably made for the large professional refractors.

More information on the Anamorfose website

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Secretan 10cm large table top telescope +/- 1850

Secretan 10cm large table top telescope +/- 1850

Early (+/-1855) 10cm (!) Secretan table top telescope with all the eyepieces and finder scope.
the scope has a very beautiful dark varnish. No cleaning needed. Will leave it as it is.

19th century table top telescopes have normally a diameter of 60mm or 75mm.  Larger models are very rare.

A very nice example of the classic French terrestrial and astronomical refracting telescope, here in a perfect original condition with all original lacquer entirely preserved and in original wood case.

Comes with a rare finder scope

Secretan, Marc Francois Louis

Nationality:  Swiss

Brief Bio:  1804-1867, mathematician; scientific instrument maker, Swiss

until 1844 - professor of mathematics at Academy of Lausanne;
1840 - worked with Friedrich von Martens and Samuel Heer producing daguerreotypes;
1844 - moved to Paris;
1845 - partnership with Lerebours as Lerebours & Secretan; used joint name until 1880s and beyond.
1855 - after retirement of Noel Paymal Lerebours became sole proprietor of Lerebours and Secretan, and signed himself as "Maison Lerebours et Secretan / Secretan, Successeur" and as "Opticien de S.A.M. l'Empereur." He also did work for the Paris observatory.
after 1860 - Secretan also issued catalogs as sole proprietor after 1860
Collaborated with William Eichens, designer of telescopes.
1860s - worked with Foucault, improved silvering techniques.
1867 - succeded by his son, Auguste Secretan (1833-1874) and nephew, Georges Secretan (1837-1906 )
1874 - succeded by his cousin, Georges.
c. 1900 - succeded by Paul Victor Secretan

More information on the Anamorfose website

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School telescopes were a tradition in Germany in the 1920's.  In Eastern-Europe several telescope makers continued to make them after the 1950's.

I didn't know of Meopta making such school telescopes.  Couldn't find any information about this scopes.

Meopta is still known for excellent optics.  Tested the school telescope and the optics are sharp and very good contrast. 

The mount is very solid.

More information on the Anamorfose website

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Antique ship deck telescope

This is a vintage marine telescope, not a contemporary copy.

Originally the telescope was mounted on the railing on the deck of a ship. 

It's a very heavy instrument with excellent optics.  The views are realy spectacular.  Crisp sharp with a good contrast.

The telescope has a fixed eyepiece with a large eye relief.  Focusing is very smooth.

The telescope was probably made between 1900 and 1920.

More information on the Anamorfose website

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Direct vision antique spectroscope

Beautiful direct vision antique spectroscope. The spectroscope works very well.

Is a large and heavy instrument.

Probably made around 1900.

The split mechanism is in brass and in perfect working condition.  Inside the tube is the prism system.

The spectroscope has a filar eyepiece.

More information on the Anamorfose website

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Other telescopes by František Kozelský

In my research for more background information about the Gajdusek-Kozelsky telescopes from the Zdanice Observatory I found an article in the Slovak astronomy magazine about a similar 20cm refractor build by Kozelsky.

After more than two years of hard work, the famous telescope builder František Kozelský from Old Běleja (Ostrava) build a refractor for observatories in his workshop.  The telescope will be installed in the observatoriy of Kysucké Nové Mesto.

It is the largest device of this type made by  František Kozelský and one of the  largest refractors in the Slovak Republic, dedicated to  amateur astronomy. We asked  the telescope designer a more detailed description of the new apparatus. He is willing and show the huge telescope. The telescope was completely setup in the hall of his house.  It’s the only place where he can mount the telescope.
In the next editions of our magazine we will report on the further installation of the telescope in the observatory

The device is built on a strong conical steel frame which ensures the stability of the telescope. The lens is from Zeiss Jena (type AS, 200 mm, f = 3000 mm). Equatorial mounting is driven by a synchronous electric motor (10 W, 3000 rpm] via a gear box with a planetary gear, which allows using the second electric motor, A hand box allows guiding in the right accession.  The drive is mounted in such a way that there is no vibration. The gearbox is permanently filled with oil. The telescope is equipped with hour circles for fine adjustments . On the setting circles eyepieces are installed for a detailed read out.

The focuser is designed for rapid exchange of eyepieces and other auxiliary equipment. On the telescope tube a Schmidt Camera is mounted with a mirror diameter of 200 mm f: 2.44.  The camera has a field of view of 7 degrees. The diameter of the film cartridge is 58 mm. The Schmidt camera was made by Ing. Wilhelm Gajdušek.

The telescope is equipped with a viewfinder with a diameter of 80 mm ff = 450 mm], which magnifies 16x. the viewfinder includes eyepieces for 75, 110, 150, 200, 313 and 600x.

Other accessories are: a zenith prism, also a Herschel wedge for direct observation of the Sun with polarizing filters and various other filters, a 3 eyepiece revolver for quick exchange of eyepieces and a solar projection screen 35 x 35 cm.

František Kozelský spend 2.5 years building this telescope

Kozmos, March 1980

The 20cm telescope described in this article is still in use in the Hlovohek Observatory.

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