M51-The Whirlpool Galaxy
an enlarged, cropped version of M51.
Takahashi FS-152 f/8 fluorite refractor
II German Equatorial Mount
Barbara Instrument Group ST-8E NABG CCD camera (1530 x 1020 pixels, 9 x 9mm, monochromatic, 16 bit, 13.8 x 9.2mm array)
color filter wheel with IR-blocking red, green and blue dichroic filters
Saturday, March 23, 2001
Joshua Tree National Park, CA
Approx. 4000', OAT +48F
Windy, moderate seeing conditions.
exposure time: Luminance=100 minutes. RGB=20:20:30 minutes at f/8