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.
|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|
|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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