David Mathre Photography

Welcome to my Images of the Day Photo blog. My goal is to post images from each day of the year going back to 2006 when I got my first DSLR camera. Images I post on Google+ are also forwarded to this Photo blog. I am a retired chemist that worked nearly thirty years in the Pharmaceutical industry. I took my first DSLR camera on a road trip across the United States, and became hooked, with my new passion becoming a photographer. I now spend all my time traveling and taking pictures. Since then I have visited over 50 countries, many on Semester at Sea voyages. My photographic interests include travel, the natural world, landscapes, and photographic techniques. I always want to learn something new and the only way to become better is to learn from mistakes.

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Ten-Years Ago Today — New Jersey

An early attempt and learning experience trying to create a star trails image. Autumn backyard night sky looking NNE. The mistake with this one was having the long exposure noise reduction selected – which meant for every image there was another 30 seconds when the camera took another dark image with the shutter closed and subtracted it from the image to remove any sensor noise. Composite of 29 images taken with a Nikon D2xs camera and 10.5 mm f/2.8 fisheye lens (ISO 400, 10.5 mm, f/2.8, 30 sec). Raw images processed with Lightroom, Capture One Pro, and Photoshop CC.

The mistake with this one was having the long exposure noise reduction selected – which meant for every image there was another 30 seconds when the camera took another dark image with the shutter closed and subtracted it from the image to remove any sensor noise. I found out later that that was not needed. The program that I was using at the time to make the composite (startrails.exe) allowed you to take one dark frame image and have it subtracted from all of the images. With the newer camera sensors I don't even need to subtract a dark frame.

#startrails #nightsky

One Response to “Ten-Years Ago Today — New Jersey”

  1. Yup right. That "dark frame" i do not used that. When the picture is exposed "enough" (see the histogram) it is not needed. Can turned off on most cameras saved the Leica M series. They have not a menu entry for that. Cannot turned off. Have that in writing from Leica support.

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