When i began imaging with a monochromatic CCD-camera, i was astonished by the sensitivity of those cameras. But, after a while, I wanted to do long exposure times and that’s sometimes a problem under our weather conditions. In Upper Austia, our long term statistic says that about 30 – 40 nights per year are useable for astro-photography. That statistic only includes nights around new moon. So, it might be difficult to get 15, 20 or even 30 hours of exposure time in one season and if you get it, there might be no time left for another target. So, first Günter Kerschhuber and after a while also I decided to expose Luminance and RGB simultaneously, with two monochromatic CCD-cameras. I currently use a Lacerta “Newton without a name”, assembled by Telescope Austria, with 250mm aperture and a focal length of 1000 mm. This one I use for Luminance imaging together with my SBIG ST2000XM camera. The second one is a Newtonian by Skywatcher with an aperture of 130mm and a focal length of 650 mm. I use a Starlight Expess SXV-H9 camera with that telescope for RGB-frames. I can do 15 min sub-exposures without getting some kind of drift between the two telescopes, even 20 min should be possible. When I started with that setup, I used MaximDL to control both cameras. But I noticed that one cyclus, including “exposure + download + dithering + delay time” vary within several seconds. So it is not possible to synchronize two cameras for several hours. I switched to Astro Art for controlling the SXV-H9 and the filter wheel and with this solution, there are no problems any more even after serveral hours. So, MaximDL is controlling the ST2000XM and the guiding and AstroArt is controlling the SXV-H9 and the filter wheel. Due to the fact that I do remote imaging sometimes, it was important to me that the alignment of the two telescopes is strong. That requirement was solved brilliant by Peter Großpointner, who built up the adaption plate. For the future, I plan to change the 5” Newtonian into a 8” Newtonian, because actually RGB-signal is down to the limit.
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Astrophotography from Ursa Major Observatory @ ROSA

Equipment
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 Luminance and RGB captured simultaneosly 
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