Current Telescopes


The acronym CA300 stands for carbon astrograph 300mm. It is a homemade Newton telescope dedicated for astrophotography.
Initially it was built to operate with my full-frame SBIG-STL11k and a 3″ Wynne Corrector. On an old Vixen Atlux mount, it was a mobile scope. Finally the scope has been retired and after some years it came back with the purchase of a Skywacher EQ8 mount which now resides in my backyard.

Diagonal Mirror120mm (40%)
Focal lenght1200mm (F/4)
MirrorOrion UK Ultra Grade
Strehl = 0.993
CorrectorASA 3KORRW 3″ Wynne Corrector 0.95x,
Lacerta GPU
FocuserDIY ASCOM Focuser Pro v1
TubeCarbon sandwich, homemade. Mount without tube rings
Thermal control8 Point diagonal heater 2W, 3 Fans 50mm

Backyard Astrophotography Soft-/Hardware Chart (left)


In the field I use my NON200 Telescope. Structure, Diagonal and OAZ are from a Lacerta 200/1000 Newton. Mirror was replaced with a GSO 200/1000mm.


It is an extremly fast Newton telescope, optimized for photographic use. BA200 is a acronym for “Boren-Simon Astrograph 200mm”, because it has the same optical system design as the famos commercial 8″ Boren-Simon Newton. The primary goal was to built a scope for narrowband imaging. My dream was to finish an object per night. The telescope is normally used with my Moravian G2-8300 CCD camera. First light was in June 2012 shooting M13.
After initial difficulties this scope has been a great success. At this point I have decided to let it imaging unattended in my garden. During the night, temperature drift was not a problem, but filter change required refocusing and I had to get up from bed. A motorfocus and autofocus stands on my wishlist. I tried Robert Browns myFocuserPro and this was the begin of a great DIY success story. Today, all of my three photographic newton telescopes have this motorfocus. Robert Browns design and software works stable and reliable and it is very well documentated.

Primary MirrorGSO 200mm f/4
Secondary MirrorOrion UK 75mm diagonal
FocuserFeather Touch FTF2008BCR
ReducerASA 2″Korr 0,73x
Messured focal length with corrector618mm (f/2.9)
Carbon Sandwich TubeKlaus Helmerichs
MotorfocusRobert Brown: myFocuserPro v1
Misc.Integrated secondary mirror heater
low profile vixen style rail, no tube rings

Skywatcher Esprit 100

The Skywatcher Esprit 100 is a triplet apo suitable for full frame cameras. It was my new optic for the SBIG STL11000 and my Canon 6D and finally the sucessor of the Pentax75. It came with a complete package: finderscope, tube rings, all adapters for photography like an M48 adapter, Canon M48 ring and a special designed field flattner. Unlike the FSQ106 the temperature drift nearly close to none. The first light was in May 2014 imaging the antares region. Many images made with this scope are in my STL11000 gallery. In October 2019 a myFocuserPro2 was added to the scope.

Special purpose telescopes

Lunt Ls60T Ha B1200 CPT

Pentax 75

TMB 115/805mm
TMB Refractor is mainly used for solar observing and the moon

Celestron C9.25
a special scope for moon and planets


ZWO ASI183MM with EFW7, TS 9mm Off-Axis Guider, GPU coma corrector. Filterwheel has 36mm Baader filters (LRGB,Ha, SII, OIII)

Moravian Instruments G2-8300, EFW-2S-10, Moravian OAG, QHY Guidecam. Photo made at Kiripotiop Namibia

SBIG STL11000M C2 full frame interline CCD camera. I never wanted such a big thing, but there was a good chance to purchase a used one in June 2008.

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