Here is the first of my images using this setup. It is also 2nd light for my new observatory.
I think this setup is a first for amateur astrophotography; 180mm of APO aperture, F5.25 and covering corner to corner of a 16803 chip with round stars. At least from what I have seen on the net. Usually maximum aperture for that would be TOA150 and reducer or AP155/160 and its reducer.
HaLRGB 70 70 60 70 for a total of 5:30 hours.
TEC180Fl F7, 4 inch Tak reducer (.75X) giving F5.25 (approx), FLI PL16803, Astrodon Gen 11 LRGB and 5nm Ha, Tak NJP mount.
http://www.pbase.com/gregbradley/image/127600632
Greg.