Lyra Ring Nebula M57(NGC6720)

 Date and Time    : 1999.2.20 05:00
 Optical Equipment: D8inch/f1,800mm/F9 Cassegrain/VISAC equatrial.
                    with SKY SENSOR2000PC. Direct Focus.
 Camera           : Cooled CCD (Mutoh CV-04/2LH) -27.0deg.C 
 Filters          : Koh-ei's multicoated filters UV, R:R60t2, G:G533t2, 
                    B:B440t2, and IR-Interference.
 Exposure Time    : L:120sec. R:120sec. G:120ec. B:160sec.
 Pinning          : L:3X3, R:3X3, G:3X3, B:3X3
 Graphic Process  : Composit of 4 colors and others with "Stella Image2"


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