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Canon T5i (Modified), Canon 300mm f2.8is II + 2.0xTC III, f5.6, 60 second exposures (107 minutes total exposure), ISO 1600, Astrotrac, Dark, Flat and Bias Frames used for calibration, Pixinsight, Photoshop, Lightroom.
Please view in shadowbox. Messier 13- The Great Globular Star Cluster of Hercules. We just had our first clear night in over three weeks and it happened to coincide with a full moon. Not wanting to miss out an opportunity, I decided to photograph a Globular Star Cluster, as it would be least impacted by the full moon than other objects such as galaxies and nebulae. I started imaging at around 11pm, and the almost full moon rose at midnight. I continued to image until close to 2:30am so from start to finish there was a wide range of exposure of sky background. This cluster only has an apparent size of about 2/3 of the full moon, so I decided to push my Astrotrac beyond its limits and shot at 600mm focal length. Due to the smaller aperture I had to shoot 60 second exposures to achieve ideal exposure. This did result in some tracking and focus error, and out of about 200 exposures I kept 107 that were tack sharp. Also of interest in this image are two tiny galaxies located to the right and slightly above this cluster. You can read more about it here: http://www.whitephotogallery.com/index. ... essier-13/ Chris White
www.whitephotogallery.com |
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by Diane Miller
on Tue Jun 09, 2015 2:40 pm
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by E.J. Peiker
on Thu Jun 11, 2015 6:00 am
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by Diane Miller
on Thu Jun 11, 2015 7:58 am
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by crw816
on Thu Jun 11, 2015 8:09 am
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by Diane Miller
on Thu Jun 11, 2015 8:21 am
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by crw816
on Thu Jun 11, 2015 9:59 am
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by Diane Miller
on Thu Jun 11, 2015 11:02 am
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by crw816
on Thu Jun 11, 2015 11:44 am
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by Diane Miller
on Thu Jun 11, 2015 12:07 pm
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by Carol Clarke
on Thu Jun 11, 2015 2:36 pm
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by John Labrenz
on Fri Jun 12, 2015 1:01 am
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by Jens Peermann
on Fri Jun 12, 2015 7:21 am
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