Star trails from my room at the Marriott Residence Inn in Boulder, Colorado. Composite of 180 images taken with a Nikon D3 camera and 24 mm f/3.5 PC-E lens (ISO 200, 24 mm, f/5.6, 30 sec exposures). Raw images processed with Capture One Pro 8, and combined using Photoshop CC 2014 (scripts, statistics, maximum). Note that these images were taken using the in-camera intervalometer and noise reduction so for every minute, only 30 seconds of exposure. I’ve learned how to do it better since then — using an external intervalometer and doing the noise reduction post processing.
Star trails from my room at the Marriott Residence Inn in Boulder, Colorado. Composite of 180 images taken with a Nikon D3 camera and 24 mm f/3.5 PC-E lens (ISO 200, 24 mm, f/5.6, 30 sec exposures). Raw images processed with Capture One Pro 8, and combined using Photoshop CC 2014 (scripts, statistics, maximum). (David J Mathre)
Author: David Mathre
I am a scientist by training (Eckerd College, BSc; Caltech, Ph.D.). I worked for 27 years as a Chemist in the Pharmaceutical Industry developing processes to manufacture medicines for human and animal health. I now spend my time as a photographer and world traveler. My interests include the natural world, wildlife, landscapes, sky, and seascapes, travel, and astrophotography. I look for unique ways of viewing the world and presenting my images. I have traveled to over 55 countries in six continents, often on Semester at Sea voyages. While at home in New Jersey, I spend time on home renovation and expansion of a wildflower garden/meadow.
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5 thoughts on “Seven-Years Ago (31-July-2008) — Colorado”
+Mary Sperley I don't understand what you mean by different colors? The sky, the stars, the background? On my monitor they look the same as the image from yesterday.
+Mary Sperley The image from yesterday and today are slightly different as the camera moved when I changed the battery. Each star has a different color, but I am not seeing them change. Maybe after I get the cataract surgery I will be able to see it better. Getting stars correct really pushes the lens, especially at the edges of the frame. But the lens I used for this image sequence is one of my better ones and should be good for the full frame. With some lenses you get purple fringing and other artifacts.
Why the different colors? Aunt Mary
+Mary Sperley I don't understand what you mean by different colors? The sky, the stars, the background? On my monitor they look the same as the image from yesterday.
The path of each star trail goes from white to various shades of blue. Aunt Mary
The image is the same from yesterday, but the trail will be white then blue.AM
+Mary Sperley The image from yesterday and today are slightly different as the camera moved when I changed the battery. Each star has a different color, but I am not seeing them change. Maybe after I get the cataract surgery I will be able to see it better. Getting stars correct really pushes the lens, especially at the edges of the frame. But the lens I used for this image sequence is one of my better ones and should be good for the full frame. With some lenses you get purple fringing and other artifacts.