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In Hercules there is one of the nicest
globular cluster of the northern hemisphere: M13. It's a concentration
of hundreds of thousands stars, grouped in a few hundreds of light years.
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| Optics | 8" Schmidt-Cassegrain telescope |
| Focal Lenght | 2000 mm |
| Focal Ratio | f/10 |
| Exposure Time | compisition onf two images of 10 min exposure |
| Film | Kodak PJ-400 |
| Developement sensibility | 400 ISO |
| Location | Tradate (VA, Italy), at 300m |
| Date and time of exposure start | 21 june 2001, 21.30 UT |
| Mount | Meade 8" |
| Tracking | Off axis guider with ST4 |
| Notes | - |
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