Star Trails. Following Hurricane Irene, we had a couple of days and nights with very clear skies. You could even see the Milky Way (although a lot dimmer than in locations with less light pollution). I set up a Nikon D3s camera with a 16 mm f/2.8 fisheye lens to do star trails last night. The settings on the camera were manual (ISO 400, 16 mm, f/4, bulb). The exposure time was controlled with a MC-36 itervelometer (delay 5 sec, long 59 sec, interval 1 sec, N —). In camera long exposure noise reduction was turned off. The 1 second interval is required to allow the data to get transferred from the camera to the card, and effectively have one image taken every 60 seconds (1 minute). The MC-36 is required for exposures longer than 30 seconds. After the images were transferred to the computer, the RAW images were processed with Lightroom, and converted to JPG. The JPG images were then processed using Startrails.exe program to make composites. The following images show a single exposure, then startrail composites of 2 minutes, 5 minutes, 15 minutes, 30 minutes, 60 minutes, 120 minutes, and 300 minutes. Some high level clouds came in for the 300 minute (5 hour) image.
North View Star Trails. Image taken with a Nikon D3s and 16 mm f/2.8 mm Fisheye lens (ISO 400, 16 mm, f/4, 59 sec). Single image before using the Startrails program. (David J Mathre)North View Star Trails. Image taken with a Nikon D3s and 16 mm f/2.8 mm Fisheye lens (ISO 400, 16 mm, f/4, 59 sec). Composite of 2 images combined using the Startrails program. (David J Mathre)North View Star Trails. Image taken with a Nikon D3s camera and 16 mm f/2.8 mm Fisheye lens (ISO 400, 16 mm, f/4, 59 sec). Composite of 5 images combined using the Startrails program. (David J Mathre)North View Star Trails. Image taken with a Nikon D3s camera and 16 mm f/2.8 mm Fisheye lens (ISO 400, 16 mm, f/4, 59 sec). Composite of 15 images combined using the Startrails program. (David J Mathre)North View Star Trails. Image taken with a Nikon D3s camera and 16 mm f/2.8 mm Fisheye lens (ISO 400, 16 mm, f/4, 59 sec). Composite of 30 images combined using the Startrails program. (David J Mathre)North View Star Trails. Image taken with a Nikon D3s camera and 16 mm f/2.8 mm Fisheye lens (ISO 400, 16 mm, f/4, 59 sec). Composite of 60 images combined using the Startrails program. (David J Mathre)North View Star Trails. Image taken with a Nikon D3s camera and 16 mm f/2.8 mm Fisheye lens (ISO 400, 16 mm, f/4, 59 sec). Composite of 120 images combined using the Startrails program. (David J Mathre)North View Star Trails. Image taken with a Nikon D3s camera and 16 mm f/2.8 mm Fisheye lens (ISO 400, 16 mm, f/4, 59 sec). Composite of 300 images combined using the Startrails program. (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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