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The North America Nebula in Cygnus is a mixture of emission, reflection, and dark nebula on our own Milky Way.
Camera: Canon 1D Mark II 8-MPixel digital camera, set at ISO 800. Lens was a 5-inch aperture, 500 mm focal length F/4 (Canon's 500 mm f/4 IS L telephoto lens). Data were recorded in raw mode, 75 second exposures, and 13 exposures were added in ImagesPlus using raw files converted to linear output by ImagesPlus 2.5. Total exposure time = 16.25 minutes. Processing included light fall-off correction and dark frame subtraction in ImagesPlus. Contrast stretch in ImagesPlus using digital development and in Photoshop using curves and levels. Image restoration using ImagesPlus Richardson-Lucey deconvolution.
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:
Image guided with an ST4 autoguider on a 3-inch f/8 refractor and a Losmandy G11 mount.
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Keywords to this image = astrophoto-1 nebula night low-light digital_astro
Image ID: ngc7000-c07.10.2005-SigAvg13.v1.3-700.jpg
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Last updated May 29, 2019