Located 5200 light years in Canis Major SH2 308 (The Dolphin Nebula) is an HII region. It is a popular subject in astrophotography.
Given the focal length of the OTA this image shows a fair amount of the filamentary detail which has heavy OIII content.
Imaged in HOO on our RiDK 400 at El Sauce, Obstech, Chile
Total integration time 43 hours 40 minutes
Image Processing: Mike Selby