M8, The Lagoon Nebula (bottom), is a very large emission nebula complex and birthplace of stars. M20, The Trifid Nebula (center right), is a complex of red emission, blue reflection, and dark nebulae about the size of the full moon. Both are located in the constellation of Sagittarius. This advanced image was shot with Canon EOS 60Da and 60D DSLR cameras and Canon EF 200mm f/2.8L II USM at f/2.8 piggybacked on top of a telescope on an equatorial mount that was tracking the sky and auto-guided with a computerized CCD guide camera and off-axis guider. The high-dynamic range image is a combination of 52 minutes of total exposure from six 2-minute, four 5-minue, and ten 2-minute exposure sub frames at ISO 800 were shot filtered with a CLS filter and also unfiltered with Canon RAW file format 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 master dark and master 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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TOP22317083

Source:

達志影像

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RM

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須由TPG 完整授權

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N/A

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No

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No

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