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Comet Lovejoy puts on a nice show in the morning sky, December 28, 2013. The tail shown here was about 6 degrees in length and about half that length was visible in 7x50 binoculars.
Technical. Canon 1D Mark IV 16-megapixel digital camera, Canon 200 mm f/2.8 lens at f/2.8, ISO 1600. Twenty 61-second exposure combined (20.3 minutes of exposure time). Full image, no crop. Stacking alignment was on the head of the comet. tracking with an Astrotrac. No flats, no darks.
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 night low-light digital_astro comet canon_1d4
Image ID: comet.lovejoy.C2013-R1.c12.28.2013.C45I1255-74.k-bin5x5s.jpg
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Last updated May 29, 2019