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OBJECT

M57 - NGC 6720 (Ring Nebula) in HaRGB   (image above is cropped 1.5x zoom | other sizes:  medium , original)

Distance:  2,300 light years

Telescope Takahashi TOA-130F @ f/7.7
Mount Takahashi EM200 Temma II
Camera QSI 540wsg @ -10C
Filters Astrodon Ha (3nm), Astrodon Tru-Balance I-Series LRGB Gen 2
Guider SX Lodestar
Settings 4x20min Ha (bin1x1); 1x5min ea RGB (bin2x2); AstroArt5, CS4 (slightly cropped, 10xdarks/flats/fdarks/bias)
Date/Location 23 September 2013 - Las Cruces, NM
Note: This object marked my first time going to 20 minute subs at long FL (1000mm).

Copyright  Jeffrey O. Johnson

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