Thank you folks!
I did an attempt with drizzling in Registax5:
http://www.prokyon.startime.at/Bilde...12drizzled.jpg
The bright spot in the middle is Elysium Mons. Its diameter is about 240 km, with a summit caldera about 14 km across. Elysium Mons was discovered in 1972 in images returned by the Mariner 9 orbiter.
And here you can see, how the seeing was. Done with IR-pass filter.
http://youtu.be/F__VimT-YIY
http://youtu.be/WiYpdaLmtV0
Cheers
Werner