Author Archives: Christoph Kaltseis


About the author

Christoph Kaltseis

Christoph Kaltseis is not only an Adobe Photoshop specialist and as Nikon Professional touring for Nikon, but also an experienced astrophotographer. He is one of the founders of the Central European DeepSky Imaging Conference (www.cedic.at), which is held every two years in Linz since 2009.

In addition to his various projects, Christoph has developed an innovative image sharpening process called APF-R (Absolute Point of Focus)in recent years. The procedure is not always the same, but is adapted to the combination of lens and camera. Therefore, a flexible method was necessary to achieve the desired results.

In his career as an astrophotographer Christoph has also created several APODs (NASA Astronomy Picture of the Day), e.g. the APF-R-processed image of the M33 Galaxy or the Heart of the Orion Nebula (M42).


  • APF-R : Absolute Point of Focus

    Update: APF-R goes online as official plugin in Adobe Photoshop Christoph Kaltseis is a Photoshop expert and an experienced astrophotographer. In recent years, he has developed APF-R (Absolute Point of Focus), an innovative image sharpening process in Photoshop that has attracted considerable interest among experts. The Hubble Space Telescope team has been using his method for over 2 years. Adobe Photoshop has now introduced the easy-to-use APF-R Photoshop CC plugin for Christoph's complex process. The tool sharpens images using APF-R with just a few clicks, even without much prior knowledge. The plugin has already proven many times that it can meet even the high quality standards in astrophotography. Read a very interesting in-depth interview with Christoph Kaltseis on Picture Instruments about his experiences in astrophotography....
  • Celestron CGX mount in combination with StarAid Revolution as guiding cam

    The CGX: A Versatile Mount For Everyone! Recently I was able to work with the Celestron CGX, the Baader Apo 95/560 Travel Companion, the Nikon D810A and the StarAid Revolution as guiding system for the first time. Once again the results proved how much you can get out of a good system if you take some time to tweak the settings a little bit instead of simply working with the factory settings of the software without taking a closer look at them. To get straight to the point: I'm really excited about what the CGX delivered last night! For polar alignment, I used the star Regulus and the integrated AllStar Polar Alignment (ASPA) system of the CGX. My alignment routine only consisted of a 2-star alignment, with...
  • SUW 08/20: In the Heart of M42 with a C14 EdgeHD

    THE STORY: In the Heart of M42 When we were still shooting on film, it was just like today: The Orion Nebula has always been on the most-wanted-list of practically every astrophotographer. This starts with wide field shots and ends with detailed images of the surroundings of the trapezoid stars in the heart of M42. This region of M42 is much brighter than the faint surroundings, and this enormous dynamic range makes photography especially tricky. The structures require a long focal length and a wide aperture to let them shine. For my imaging I chose Celestron's C14 EdgeHD, which is still compact despite its size and therefore doesn't require an gigantic mount. At an f/ratio of f/7.6 with the special reducer designed for full-frame cameras, I...
  • 1st Light with the QHY600 EB: a first field report

    Darkness Became Light! ... A Quantum Leap in 36 x 24mm at 61.1MP? In recent years, color cameras have become increasingly popular. A reversal of the trend is not to be expected. One reason for this is the ability to capture weak structures in deep-sky objects even with moderate exposure times. Developments in CMOS sensors and recently the BSI sensor technology have played a decisive role in this. In addition, both quantum efficiency (QE) and full-well capacity increased, noise was reduced, pixels became smaller and smaller, and dynamics increased with almost every new sensor generation. What happens when all these developments see the light of the stars in a new camera like the QHY 600M with a black and white sensor? I had asked myself...
  • SUW 05/20 Poster: CDK 14 and Veil Nebula - it can be so easy

    THE STORY: Veil Nebula and Planewave CDK14 – it can be so easy The "Veil Nebula" NGC 6960 is a remnant of a supernova explosion that occurred 8000 to 10,000 years ago. With a length of over one degree it is huge - and the Cygnus loop, to which the Veil Nebula belongs, is even larger at around 2°! For this picture, images from two nights were combined, whereby subframes with seeing values worse than 2.05" FWHM were not used. Now, I have to admit my preference for long focal lengths right at the beginning. As far as conditions allow, I want to get details out of the pictures - and since I have a location that often has good to very good seeing, I...
  • The First Impression: RASA 8 With ATIK Horizon Colour Camera

    RASA 8 – The family is complete – First Impressions Here is a firsthand report by Christoph Kaltseis about his work with the RASA 8 and an ATIK Horizon colour camera. On the ATT fair I was asked by the company Baader if I'd like to test the newly announced RASA 8" - Rowe-Ackermann Schmidt Astrograph (#822252 € 2.195,-) . I've been using both the RASA 11" - Rowe-Ackermann Schmidt Astrograph (#822250, € 4495,-) and the larger RASA 36cm - Rowe-Ackermann Schmidt Astrograph (#822251) successfully for some time now. So I know the system of the Rowe-Ackermann-Schmidt-Astrographs very well and know the potential of these optics. So I didn't have to think twice before agreeing to a test. What can be said "Out-of-the-box" about the...
  • SUW 02/20 Poster: M31 in only 4,5 hours

      THE STORY: An M31 that fell from the sky The Andromeda galaxy is an object seen by every amateur astronomer, either with own eyes or as an image. I was particularly fascinated to image our magnificent neighboring galaxy with the RASA 8" - Rowe-Ackermann Schmidt Astrograph (#822252, € 2195,-) under a perfectly dark sky. This was one of the reasons why my way led me to La Palma for one week in October 2019, to do my images at the Athos Centro Astronómico (www.athos.org). The QHY 163M camera is a perfect fit on the RASA 8" in terms of field size and pixel scale for M31. For a monochrome camera, the Baader FCCT (Filter Changer & Camera Tilter - see also the test report by Michael...
  • C14 Edge-HD f/11 with 12.000mm focal length - "Mission Impossible" accomplished?

    Theory becomes Reality! Last weekend, on the 17th of February 2019, it seems I achieved my "mission impossible". With my C14 Edge HD f/11 and the Baader FFC 3x (on a 10Micron GM 2000 HPS mount) I was close to 12.000 mm (12 meters!) focal length. Myself and Baader Planetarium optimized my C14 Edge HD to dive into this performance. It looks just like a photo: Is a 4K / 30fps video live and in real time possible? Can a sharp and bright video be achieved with a resolution of 0,21 arcsec live at my Nikon Z6 Display with full format chip (36mm x 24mm)? The answer can be found in the video. Please note the nearly complete absence of any air turbulence. This short journey across...
  • APOD: M33 - Triangulum Galaxy taken with Planewave CDK14

    Impressive Image, taken with PlaneWave CDK14, chosen as APOD (27. September 2018) Convince yourself of the incredible resolution   The small, northern constellation Triangulum harbors this magnificent face-on spiral galaxy, M33. Its popular names include the Pinwheel Galaxy or just the Triangulum Galaxy. M33 is over 50,000 light-years in diameter, third largest in the Local Group of galaxies after the Andromeda Galaxy (M31), and our own Milky Way. About 3 million light-years from the Milky Way, M33 is itself thought to be a satellite of the Andromeda Galaxy and astronomers in these two galaxies would likely have spectacular views of each other's grand spiral star systems. As for the view from planet Earth, this sharp image shows off M33's blue star clusters and pinkish star...
  • M45 - the Plejades taken with Baader APO and GM 1000 HPS

    The following image of the Pleiades (M45), which our customer Christoph Kaltseis has achieved with the Baader APO Travel Companion and the 10 Micron GM1000HPS on La Palma (Athos Campus), is a special treat regarding image detail and star rendition. Partically interesting is the Nikon D810A camera with a 36x24mm sensor and 4.87my pixels. Its sensational resolution will show any aberations in the optical system straight to the edges mercilessly. Most CCD cameras either have smaller sensors or much larger pixels, which helps to camouflage optical deficiencies. Not to speak of bad seeing... Image editing / sharpening was done with the APF-R Method. Due to the good optical quality of Baader APO,  airy discs with 5 micron diameter where archieved – not to mention the...

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