|The planetary nebula Messier 57 ("Ring nebula") in the constellation of Lyra on
October 2, 2011. Six 4 minute exposures at ISO 1600 were added for this shot with the DeepSkyStacker software
and the final image processing was done in Photoshop. My first attempt with 8 minute exposures failed since the nebula already showed
||Equipment: Canon EOS 20Da camera, TeleVue coma corrector, Zambuto 16" f/5
quartz optics in a Dieter Martini dobsonian telescope, dual-axis Tom Osypowski equatorial
platform, Lacerta MGEN autoguider, Teleskop-Service
off axis system TS-OAG9 EOS.