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M8, the Lagoon Nebula and M20, the Trifid Nebula in Sagittarius rises high in the summer for northern hemisphere observers.
Technical. Canon 1D Mark IV 16-megapixel digital camera, 300 mm f/2.8 L IS lens at f/2.8. Nine 1-minute exposures at ISO 1600. Nine minutes total exposure. Tracking with an Astrotrac (unguided). Aligned and the 9 images combined with sigma clipped average in ImagesPlus. No dark, no flats were used, nor were any needed. This is a full width crop from a vertical image. This image is 1/3 of full resolution.
The Exposure Factors, CEF, CEFA are measures of the relative amounts of light received from a subject. It can be used to fairly compare wildly different lens/telescope apertures and exposure times. For this image:
For 1/2 resolution image (0.9 megabytes) can be seen HERE.
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Keywords to this image = astrophoto-1 nebula Messier night low-light digital_astro canon_1d4
Image ID: m8+m20_300mm.c06.07.2013.C45I2995-3005.c-bin3x3-crop1.jpg
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Last updated May 29, 2019