|The galaxy NGC 7331 in the constellation of Pegasus on
October 23 & 27, 2011. The spiral is about 46 million light years from Earth and was discovered by William Herschel in 1784. More
galaxies can be seen above and to the left of NGC 7331 (NGC 7340, NGC 7337, NGC 7335, NGC 7336). They are further away
(300-400 million light years).
Five 8 minute exposures and four 15 minute exposures at ISO 1600 were combined in Deep Sky Stacker & Photoshop and further image processing was done in Photoshop. The image doesn't really show what's possible with a total exposure time of 1 hour and 40 minutes - severe light pollution and camera noise at ISO 1600 (amplifier glow, banding, general noise) made the post-processing difficult. In addition, the sub-images didn't show exactly the same field of view so background noise varies in the image.
|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.|