High Resolution Astrophotography Messier 101 | M101 | NGC 5457 | Arp 26 - The Pinwheel Galaxy in the constellation Ursa Major   Parameters -   Detector -   Filters -   Optics -   Mount -  xs  ASI 290MM-C  none  Homemade Newton 305/1500 Telescope  Homemade English Yoke Mount