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
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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