M51 Whirlpool Galaxy in LRGB from AP180EDT f/9 and FLI Proline 3200 with Optec RGB filters

34 x 400 sec Clear + 1.5H RGB (2x2)

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Unfiltered: 34 x 400 sec

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Taken on April 25 & 26 and May 1, 2008 from my ranch near Mariposa, Ca.  

Astro-Physics AP180EDT f/9 imaging scope used at f/9

Finger Lakes PL3200  imaging camera operated at -45C

Robo-Focus Focuser

Finger Lakes CFW7 Filter wheel

Astro Physics 80/900mm guide scope

SBIG ST7E guide camera

Optec RGB filters, 50.8 mm unmounted

34 exposures of 400 seconds unfiltered for luminance: 3 hours 40 minutes

10 exposures of  three minutes for each color filter, R, G, B; 1.5 hours total color exposure time

Total exposure time = 5 hours 15 minutes

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