Open Cluster M23 (NGC6469)

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<Image : Open Cluster M23>
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<<Photography Data>>
Date: May 20th, 2009.
Location: Mito, Ibaraki, Japan.
SIGMA APO TELE MACRO 300mm F4.0 lens (diaphragm F5.54)
IDAS LPS-P1 filter
Takahashi EM-400 Temma2 equatorial mount
automatically guided with D80mm f560mm refractor + NexImage & GuideWalk
BITRAN cooled CCD camera BJ-41L(-5.0 °C)
IDAS Type Ⅲ RGB separation filter
R,G and B images were taken with 2×2 binning
Exposure: L;10min. ×10 frames
R; 7min. ×3 frames, G, B; 3min. ×3 frames each
LRGB composition (total exposure time : 151min.)
Image processed with StellaImage6, Cinepaint & The GIMP.

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