High Resolution Astrophotography NGC 4490 | Arp 269 - The Cocoon Galaxy in the constellation Canes Venatici   Parameters -   Detector -   Filters -   Optics -   Mount -   Concept -  200x20s  ASI 290MM-C  none  Homemade Newton 305/1500 Telescope  Homemade English Yoke Mount  DIAVS