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The Ring Nebula is in the costellation
of Lyra. It's a planetary nebula with a typical ring shape caused by the
expulsion of matter from the central star, visible in this image.
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| Optics | 8" Schmidt-Cassegrain telescope |
| Focal Lenght | 2000 mm |
| Focal Ratio | f/10 |
| Exposure Time | 40 min exposure |
| Film | Kodak E200 |
| Developement sensibility | 320 ISO |
| Location | Tradate (VA, Italy), at 300m |
| Date and time of exposure start | 11 october 2001, 20.05 UT |
| Mount | Meade 8" |
| Tracking | Off axis guider with ST4 |
| Notes | - |
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