High Resolution Astrophotography Messier 71 | M71 | NGC 6838 - globular cluster in the constellation Sagitta   Parameters -   Detector -   Filters -   Optics -   Mount -   Concept -  700x500ms  ASI 290MM-C  none  Homemade Newton 320/1500 Truss Telescope  Homemade English Yoke Mount  DIAVS