M101 in Ursa Major-LHaGB Image
Imaged from Florida, Spring, 2012 through a Canon 600mm f4.0 telephoto lens and EF1.4X Telextender using a SBIG ST-8300M CCD Camera with Astrodon LGB and 3nm Ha Filters.
This object is a long stretch for the Canon 600mm lens and would benefit from considerably more magnification.
| Data | |
|---|---|
| Taking Camera SBIG ST-8300M | LGB from Chiefland ~mag 5 - no moon @-20C and Ha from Sun City Center ~mag 4 - no moon @-15C |
| Imaging OTA | Canon EF 600mm f4.0IS with EF1.4X |
| Equivalent focal length and ratio | 840mm f5.6 |
| Mount | Losmandy G11 Gemini 2 |
| Guiding | PHD with SBIG STi 100mm/f2.8 Guidescope |
| L | 20X5' unbinned |
| R | 13X15' Ha unbinned |
| G | 5X5' binned 2X2 |
| B | 10X5' binned 2X2 |
| Calibration and Stacking | Darks and Bias Frames for L and Ha only. No flats - Deep Sky Stacker |
| Processed | PixInsight and Adobe Photoshop CS4 |
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