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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26-June-2011

More Fireflies in My Backyard.

Another composite image of fireflies in my backyard. This time with a telephoto lens at f/13 to try to get a deeper depth of field effect. As before, the  camera was set up to take 25 second images, and the resultant 110 images combined using the Startrails program.

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Backyard Fireflies. Early Summer in New Jersey. Image taken with a Nikon D3s and 600 mm f/4 lens (ISO 2500, 600 mm, f/13, 25 sec). Images processed with Capture One Pro, Startrails (used to stack 110 images), and Photoshop CS5. (David J Mathre)

Backyard Fireflies. Early Summer in New Jersey. Image taken with a Nikon D3s and 600 mm f/4 lens (ISO 2500, 600 mm, f/13, 25 sec). Images processed with Capture One Pro, Startrails (used to stack 110 images), and Photoshop CS5.

2 Responses to “26-June-2011”

  1. David Brooks says:

    Hey Dave:

    Why are they green?

    • David says:

      David,
      Thanks for the question. I hadn’t really thought about it, so found a reference that “Dark-active North American fireflies emit green bioluminescence and dusk-active species emit yellow.” in the linked scientific paper Ecology of Colors of Firefly Bioluminescence . This set of images was from later at night so I would have a nearly black background. I’ll have to try it again at dusk to see if I can detect a more yellow color. The hard part will deciding on the best white balance.
      DJM

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