M57
Optics Schmidt-Cassegrain 12" - F 10 Focal 3048 mm Mount Gemini G40 Camera SBIG ST-2000 xm Filters SBIG Standard LRGB. Dates Lug 2005. Location  Acilia (Roma) Exposure HLRGB = 450:300:150:100:150 minutes. Acquisition  CCDSoft, TheSky6