With Hydrogen Alpha filter
With Hydrogen Alpha filter
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LRGB without Ha
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Taken on February 3, 2003 from my backyard in Castro Valley, Ca.
The Hydrogen Alpha filter reveals the large hydrogen emission nebulae in the spiral arms of M81.
Astro-Physics AP155EDF f/7 imaging scope
SBIG ST10XE imaging camera w/ FLI CFW1 Filter wheel
Astro-Physics 80mm guidescope
SBIG ST7E guide camera
OPTEC IR-Blocking LRGB Filters
Schuler Hydrogen Alpha (9nm) filter
12 x 15 minutes Halpha
4 x 10 minutes Red, Green, Blue
9 x 10 minutes Luminance
Top image combined as HaGB
Lower image combined as LRGB
Maxim DL used for image capture, calibration and alignment. Sigma Beta 10 is used for combining lights, darks, biases, flats. Photoshop 7.0 used for image manipulation and color combine. Eddie Trimarchi's FITS Plugin used with Photoshop