M81 (left) and M82 Galaxies
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Imaging
Equipment:
- Telescope:
Takahashi FSQ-106N f/5 4-element fluorite refractor
- Zeiss
II German Equatorial Mount
- Santa
Barbara Instrument Group ST-8E NABG CCD camera (1530 x 1020 pixels, 9 x 9mm, monochromatic, 16 bit, 13.8 x 9.2mm array)
- CWF8
color filter wheel with clear and IR-blocking red, green and blue dichroic filters
Exposure
Information:
- Date:
Saturday, December 26, 2000
- Location:
Joshua Tree National Park, CA
- Elevation:
Approx. 3500', OAT +34F.
- Total
exposure time: 130 minutes. (14x5 minutes luminance, 4x5 min. red, 4x5
min. green, and 4x5 min blue)
- Color
Stacking: White-light luminance behind RGB tricolor image.
- Processing:
Dark and flat cal, mean (not median) combining and DDP (on luminance) with
MaxIm. LRGB stacking, final level adjustment,
color balance, blooming repairs, crop and security with Photoshop.
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