Planetary Nebula, the Blue Snowball, shot with VC200L at 3600mm FL by using 2X extender of Sigma, made for Canon EF lens. ISO3200, 45 second exposures. 10 lights, 10 darks and 10 flats. New shooting http://www.urata123.com/X-urata/astro/ngc7662_ds_cs2.jpg
2011-12-17 17:05 
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