Locations and Equipment

Member of Sternfreunde Breisgau association




1. The observatory of the Sternfreunde Breisgau association is located on the area of the Kiepenheuer Institute for Solar Physics on the Schauinsland mountain in the Black Forest near Freiburg (1240 m / 4100 ft a.s.l., 47° 54′ north, 07° 53′ east). It is accessible to members of our association. On the image you see the two domes of the observatory. The main telescope is the ‚Bath-Astrokamera‘ (right image) in the western (left) dome. The piggy pack telescope is a Celestron 8.


The observatory on the Schauinsland mountain
The observatory on the Schauinsland mountain


2. Observatory of the IAS: 23° 14′ 28.3″ south, 16° 21′ 47″ east. More Information on the IAS website.


CCD Cameras

STF-8300M: arrived in Mai 2015. With this camera I want to get back into astrophotography. Why this camera? The chip is larger than the chip of my former ST-10 (see below), the pixels are smaller (and match therefore better with smaller focal lengths) and they do not bloom. And the camera is much cheaper than the ST-10. In fact I think it is one of the cameras with the best chip area / price relation.

ST-i: bought in July 2014 as guiding camera and perhaps for planetary imaging.

ST-10 XME: arrived on Mai 12, 2001 and was upgraded with USB interface, high sensitive ME chip and with the larger TC-237 tracking CCD in June 2002. It was primarily achieved for wide field CCD imaging at short focal length with my Pentax SDUFII (see below). But now I take most of my images with that superb camera. Sold Jan. 2009.

ST-8 E: owned by the Sternfreunde Breisgau association; most of the CCD images until 2001 are taken with that camera.

ST-7: old CCD camera of the Sternfreunde Breisgau association, now sold. Only M 106 (my very first LRGB) is taken with that camera.



  1. Takahashi 60 CB. This is my last acquisition: a 60 mm (2.4 inch) Apo Refractor with a focal length of 355 mm (f/5.9) and with reducer with only 256 mm (f/4.4). I bought it as a travel telescope and I plan to use it for wide field imaging with the new ccd-camera.
  2. Takahashi 128 FS. This is a great 128 mm (5 inch) Doublet Apo Refractor with a focal length of 1040 mm (f/8.1). I was happy to buy it as used item for a very reasonable price in September 2011. First I used it only for visual observing, but in September 2013 I bought an Avalon Linear Mount and in July 2014 the original Takahashi focal reducer to get back in astrophotography.
  3. William Optics Megrez 72. This is a 72 mm (2,8 inch) Doublet Apo Refractor with a focal length of 432 mm (f/6). I bought it in March 2009 and sold in March 2012.
  4. OMC 140. This is a 140 mm (5,5 inch) Maksutov Cassegrain with a focal length of 2000 mm (f/14). I owned it between June 2005 and December 2013 and used it mainly for visual observing.
  5. Pentax 75 SDHF. This is a 75 mm (3 inch) refractor borrowed from Astrooptik Philipp Keller for a while. The focal length is 500 mm.
  6. Pentax SDUF II. This is a 100 mm (4 inch) refractor purchased from Astrooptik Philipp Keller. The focal length is only 400 mm, and therefore it forms a great combo with the ST-10E CCD camera for wide field imaging (see image below). Sold Sept. 2008.
  7. Keller-Newton. The largest telescope of the Schauinsland Observatory (Sternfreunde Breisgau assoc.). It is a Newton telescope with a mirror diameter of 38 cm / 15 inches and a focal length of 2000 mm (f/5,2 with reducer/corrector).
  8. Bath-Astrokamera. Telescope of the Schauinsland Observatory (Sternfreunde Breisgau assoc.). It is a Newton telescope optimized for astro-imaging, with a mirror diameter of 25 cm / 10 inches and a focal length of 1050 mm (f/4,2). Therefore it is outstandingly well suitable for imaging of large sized deep sky objects. It was designed by K.-L. Bath. telescope is installed on a heavy fork mount. See right image above.
  9. At the IAS Observatory in Namibia, I also used a Celestron 11 with a Lumicon Giant Easy Guider with a ST8E for imaging. It was installed on a Fornax – Mount (some 30 kg).


The Pentax, the ST-10E and me on my veranda downtown Freiburg, Germany

Processing of Film Images

On film, 2 to 5 negatives of each object were taken, leading to a total exposure time up to 5 hours. For emission nebulae I used a Lumicon deep sky filter. Tracking was done with a ST4. The negatives were scanned with a Nikon Coolscan III LS 30 and combined with MIRA 6.0 imaging software. Further processing was done with Photoshop 5. The original scans (TIF-files of 25 to 30 MB) were reduced in size and saved as JPG-files.