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The detail in the ring is approximately the view one gets from about an 8-inch telescope in dark skies. Stars shown are approximately what can be seen in a 12-inch telescope in dark skies. This is the full resolution image, cropped from the larger 6-megapixel 10D frame. Plate scale = 2.1 arc-seconds/pixel.
500 mm f/4 + 1.4x TC = 700 mm f/5.6, Canon 10D camera at ISO 800. Added 27 (2 15-second, 2 10 sec. and 23 8-second) exposures made from in the Denver metro area. Faintest star ~ 16.0.
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:
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Keywords to this image = astrophoto-1 nebula Messier digital_astro
Image ID: m57.c06.01.2003.700mm.d.jpg
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Last updated May 29, 2019