SBIG ST10 E
L=8x120s 1xBin, 23.06.2002
Max Valier 80cm Cassegrain f/10 (equatorial mounted)
4800mm  f/6
Schuler H-Alpha Filter 3nm
4-lens Reducer custom made
average of 1.3 arc seconds
MaximDL LRGB composit, PS 5.5, CCDSharp
low transparency, near full moon, but TOP SEEING.
Philipp Keller, Georg Lercher and Dieter Seiwald

The exposure time was much to short because the day light interrupted this try of the Schuler Filter. The accuracy of the Schuler seems to be very good, we saw no astigmatism or other errors like we experienced with other H-Alpha filters.

The image was not off-set guided. The accuracy of the mount is better than 0.2 arc seconds RMS in 5 minutes.