Trifid Nebula

August 07, 2012

(1 Image)

Tags: eos 60Da

M20, The Trifid Nebula, in the constellation of Sagittarius, is a remarkable object - large, bright and beautiful. It is a complex of red emission, blue reflection, and dark nebulae about the size of the full moon.

This advanced image was shot with a Canon EOS 60Da DSLR camera and an apochromatic refractor with a focal length of 1,000mm working at f/8 on an equatorial mount that was tracking the sky and auto-guided with a computerized CCD guide camera and off-axis guider. 16 minutes of total exposure from two 8-minute sub frames at ISO 800 were shot unfiltered as in-camera RAW images, at a reasonably dark magnitude 6 observing site. A min-max excluded combine method was used to average the light frames and each was calibrated with a master dark made of 5 sub-darks and a master bias made from 4 sub-bias frames. A custom white balance from a G2V star was used. Image contrast and color were adjusted in post processing.

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