M57 Ring Nebula in Halpha, [OIII] and Helium II

   

Halpha = Red, [OIII] = Green, Helium II = Blue (wavelength ordered palette)

Taken on  July 19 and 20, 2006 from my backyard in Castro Valley, California

Stinger 450 Classical Cassegrain (18" f/12.6)

Lumicon Giant Easy Guider with Focal reducer for final: F= 3366mm, f/7.1

Finger Lakes CM10 MaxCam imaging camera operated at -26C

Robofocus

Finger Lakes CFW1 Filter wheel

SBIG ST7E guide camera

Custom Scientific 3nm FWHM Ha filter (50mm diameter)

Custom Scientific 3nm FWHM [OIII] filter (50mm diameter)

Custom Scientific 3nm FWHM Helium II filter (50mm diameter)

Six exposures of 30 minutes in Helium II

Five exposures of 30 minutes in [OIII]

Four exposures of 30 minutes in Halpha

Seven and a half hours total exposure time

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