M21 - Open Star Cluster
| Object | Open Star Cluster (M21), in Sagittarius | |
| Telescope (Photo) | Meade LX200GPS 12” SCT @ f/6.3 | |
| Telescope (Guiding) | Meade LX200GPS 12" SCT @ f/6.3 (off-axis) | |
| Camera (Photo) | Canon 20Da DSLR | |
| Camera (Guiding) | Meade DSI Pro II w/Autostar Envisage | |
| Exposure Detail | Median combination of 13 images at 60 seconds each, ISO1600; RAW file conversion, full calibration (bias, flat, dark), and initial image processing using ImagesPlus 2.82; final image processing using Photoshop CS3 | |
| Location | Cincinnati Astronomical Society's Dark-Sky Site (Adams County, Ohio) (N38.876, W83.464) | |
| Date | 08/17/07 |