[天文书籍]bhubl_wide_field_imaging.pdfVIP

Wide Field and Long Focal Length Imaging Bernhard Hubl AIC 2012 Contents  Location and equipment  Image acquisition  Calibration, registration and combine  Image processing  Examples My observatory Source: Google Maps My observatory My northern sky Observatory Observatory in action Self-made 12” SBIG ST- Newtonian 2000XM 4” TeleVue NP101 AOK WAM650 DSLR or SBIG ST-8300C Source: Herbert Raab Contents  Location and equipment  Image acquisition  Calibration, registration and combine  Image processing  Examples Image Scale and Seeing  Image Scale • 12” Newtonian + ST-2000XM: 1.3”/px • NP101 + DSLR: 2.2”/px (Bayer) - 3-4”/px (effective)  Seeing at my location • Typical: 2.4 – 3.2” • Excellent: 1.9 – 2.2” • Bad: 4 – 7”  Conclusion: • Wide Field nearly always productive • Newtonian: Lum 2.6” / RGB 4.0” Tip #1 Introduce clear seeing limits  In my case: • 2.6” Lum • 2.6” – 4.0” RGB • 4.0” – 5.0” only wide field • 5.0” go sleeping or go for a beer!  Advantage: • No waste of nights with good seeing for RGB • Reproducibility Mount  Focal leng