ASTRO BERLIN ORTH, Another missing link in the Evolution Tree of Eyepieces

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j.gardavsky
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ASTRO BERLIN ORTH, Another missing link in the Evolution Tree of Eyepieces

#1

Post by j.gardavsky »

Hello all,

because of my curiosity, I have added to my collection of the astronomy eyepieces this ortho,
Astro Berlin Orth comp.jpg
This orthoscopic astronomy eyepiece has a very simple lenses sequence (field stop - 1 - 1), the both lenses are narrow spaced biconvex.
The narrow field of view competes with that of the TMB Super-Monocentric.
The eye relief is not worse than that of the Abbe orthos.
The way how the lenses are mounted in an oversized drum reminds me of Stenheil in München, around 1907.


The ASTRO BERLIN has been founded in 1922 by Willy Bielicke, Astro-Gesellschaft Bielicke & Co.
The astronomy section of the company has been under H.I. Gramatzki, the designer of the first zoom eyepiece (Transfokator).




And on a side line to the Ortho, here is the Gramatzki's zoom eyepiece,

https://upload.wikimedia.org/wikipedia/ ... or.tif.jpg
Transfokator.jpg
Herewith it is likely, that the ASTRO BERLIN ORTH eyepiece has been aslo designed by Gramatzki, maybe even one of his first astronomy optics designs.

Best,
JG
6" F/5 Sky-Watcher achro, 2" BBHS Star Diagonal, 2" zenith prism, 1.25" Takahashi prism
Leica 82mm APO Televid
Eyepieces: Docter UWA; Leica B WW and WW Asph. Zoom; Leica HC Plan S and L; Pentax SMC XW, O-, XO; Tak MC O, Carl Zeiss B WW, and Pl, E-Pl, S-Pl, W-Pl;
Swarovski SW; Baader Symmetric Diascope Edition; KK Fujiyama orthos: TMB supermonocentric; Rodenstock; Tele Vue;
Barlows: Baader VIP, Nikon EiC-16
Filters: Astrodon, Astronomik, Baader, Balzers, Zeiss West and East, Lumicon
Binoculars (7x42 up to 15x85): Docter Nobilem, Leica Ultravid, Nikon Astroluxe, Swarovski EL Swarovision; BA8 (Kunming Optical)
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John Baars
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Re: ASTRO BERLIN ORTH, Another missing link in the Evolution Tree of Eyepieces

#2

Post by John Baars »

Nice find!
Have you observed with it yet?
Telescopes in Schiedam in frequency of use : *SW Evostar 120ED F/7.5, * SW 150mm Achromat F/5, *grabngo: SW 102 Maksutov F/13, *Vixen 102ED F/9, *OMC140 Maksutov F/14.3, on Vixen GPDX.
Most used Eyepieces: *Panoptic 24, *Leica ASPH zoom, *Zeiss barlow, *Pentax XO5.
Most often used binoculars: *AusJena 10X50 Jenoptem, *Swarovski Habicht 7X42, *Celestron Skymaster 15X70, *Kasai 2.3X40

Rijswijk Observatory Foundation telescopes: * Astro-Physics Starfire 130 f/8 on NEQ6, * 6 inch Newton on GP, * C8
on NEQ6, * Meade 14 inch SCT on EQ8, *Lunt.

Amateur since 1970.
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Lady Fraktor
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Re: ASTRO BERLIN ORTH, Another missing link in the Evolution Tree of Eyepieces

#3

Post by Lady Fraktor »

Very unique JG.
A nice looking addition to the collection and I look forward to your thoughts of it in use.
The Gramatzki zoom appears to be another intriguing design!
Telescopes: 1 more than I need but 2 less than I want
Mounts: 5 Equatorial, 3 Az/ Alt
Diagonal: 3 mirror, 2 Amici, 1 Herschel
Eyepieces: Possibly more than 1 person requires
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j.gardavsky
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Re: ASTRO BERLIN ORTH, Another missing link in the Evolution Tree of Eyepieces

#4

Post by j.gardavsky »

John Baars wrote: Sat Sep 11, 2021 12:37 pm Nice find!
Have you observed with it yet?
Hello John,

not yet, today I took just the documentary pictures.
To use it on the elescope, the lenses would require cleaning.
Otherwise, I would not expect much from a symmetric aplanatic design eyepiece. I take it as a piece of history.

Best,
JG
6" F/5 Sky-Watcher achro, 2" BBHS Star Diagonal, 2" zenith prism, 1.25" Takahashi prism
Leica 82mm APO Televid
Eyepieces: Docter UWA; Leica B WW and WW Asph. Zoom; Leica HC Plan S and L; Pentax SMC XW, O-, XO; Tak MC O, Carl Zeiss B WW, and Pl, E-Pl, S-Pl, W-Pl;
Swarovski SW; Baader Symmetric Diascope Edition; KK Fujiyama orthos: TMB supermonocentric; Rodenstock; Tele Vue;
Barlows: Baader VIP, Nikon EiC-16
Filters: Astrodon, Astronomik, Baader, Balzers, Zeiss West and East, Lumicon
Binoculars (7x42 up to 15x85): Docter Nobilem, Leica Ultravid, Nikon Astroluxe, Swarovski EL Swarovision; BA8 (Kunming Optical)
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j.gardavsky
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Re: ASTRO BERLIN ORTH, Another missing link in the Evolution Tree of Eyepieces

#5

Post by j.gardavsky »

Lady Fraktor wrote: Sat Sep 11, 2021 4:55 pm Very unique JG.
A nice looking addition to the collection and I look forward to your thoughts of it in use.
The Gramatzki zoom appears to be another intriguing design!
Hello Gabby,

the zoom eyepiece design looks quite interesting, even if not parfocal across its zooming range.

The optics developments in the city of Berlin became somehow forgotten. And regarding the astronomy optics, it has been difficult to compete with Steinheil in München, and with Zeiss in Jena.

Best,
JG
6" F/5 Sky-Watcher achro, 2" BBHS Star Diagonal, 2" zenith prism, 1.25" Takahashi prism
Leica 82mm APO Televid
Eyepieces: Docter UWA; Leica B WW and WW Asph. Zoom; Leica HC Plan S and L; Pentax SMC XW, O-, XO; Tak MC O, Carl Zeiss B WW, and Pl, E-Pl, S-Pl, W-Pl;
Swarovski SW; Baader Symmetric Diascope Edition; KK Fujiyama orthos: TMB supermonocentric; Rodenstock; Tele Vue;
Barlows: Baader VIP, Nikon EiC-16
Filters: Astrodon, Astronomik, Baader, Balzers, Zeiss West and East, Lumicon
Binoculars (7x42 up to 15x85): Docter Nobilem, Leica Ultravid, Nikon Astroluxe, Swarovski EL Swarovision; BA8 (Kunming Optical)
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