4" (100mm) f/7 Apo Refractor with Lichtenknecker FH 30 Helical System 67


The field flattener is on backorder!

Manufacturer's description:

"Die Firmen Tele-Optic und Feinmechanik Jürgen Thomaier haben in
zusammenarbeit mit Optolyth, dieseit mehr als 175 Jahren weltweit für
herausragende optische Qualität im Bereich der Jagdoptik bürgen, diesen
apochromatischen Refraktor entwickelt.
Objektiv: 3-Linsiger HD-Fluorit-Apochromat ohneLuftspalt mit 92% Definitionshelligkeit nach
Strehl ( Trichromatisch )
Vergütung: Ceralin Plus auf beiden Glas-Luftflächen
Öffnung: 100mm ; Brennweite: 700mm ; Tubusdurchmesser: 115mm"

"The companies Tele-Optic and precision engineering Jürgen Thomaier designed,
in co-operation with Optolyth, who stands for excellent quality in the area of
hunt-optics for more than 175 years, this apochromatic refractor.
Lens: Triplet HD-fluorite-apochromat without air spacing; strehl ratio is 92%
Coatings: Ceralin Plus on both exposed sides.
Clear aperture: 100mm (4") ; Focal Length: 700mm (f/7) ; Tube diameter: 115mm (4.5")



The weight is about 4.8kg(10.5lbs) (OTA only). With tube rings and guide scope it's about 7kg (15.4lbs)

My tests with the Baader Microguide eyepiece gave a visual focal length of 704mm.

The Periodic Error with this setup is smaller than 5" on the G-11.

First pictures of the OTA:

visual mode

photographic mode

OTA with custom tube rings and the 3" f/5 (80/400mm) guide scope on the Losmandy G-11


The first star test on Vega (at 140x) showed virtually no color and no error whatsoever. With my ACHROMATIC (!!) 2,4x Barlow I could see some color (violet) at 337x just before and after focus, but NOT AT FOCUS! The airy disc is like in the textbook!
I'm really looking forward to see Mars, Jupiter and Saturn through this optics...



On May 20th, 2001 I could take the first two test-photos (in nautical & astronomical twilight).

I shot 'Mel 111' = Coma Berenices Star Cluster and the Galaxy Cluster around M86

M84, M86 , M87, and a satellite ... (with Skymap overlay)

20 minutes on Kodak PJ 400

a) b)

(this zooms are reseized by 50%)

Mel 111 = Coma Berenices Star Cluster

30 minutes on Kodak PJ400

Center at 2400 dpi

See those little stars! The stars looking like double stars results from bad guiding. I'm still waiting for the guidescope tube rings... The dimmest star here is about 15m0

bottom left corner at 2400 dpi

I'll be pleased with the field flattener!


Erhältlich bei Gerald Rhemann ( www.astrostudio.at)

Comments welcome at arcturus@surfeu.at

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