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.

Friday (15-February-2008) — New Jersey

Backyard Winter Night Sky in New Jersey. Moon Ring and Orion.

The 22° Halo around the moon is caused by refraction of ice crystal high in the atmosphere.

Winter Night Sky over New Jersey. Moon, moon ring, Orion. Image taken with a Nikon D3 and 17-35 mm f/2.8 lens (ISO 200, 17 mm, f/2.8, 30 sec). (David J Mathre)
Winter Night Sky over New Jersey. Moon, moon ring, Orion. Image taken with a Nikon D3 camera and 17-35 mm f/2.8 lens (ISO 200, 17 mm, f/2.8, 30 sec).

Sunday (10-February-2008) — New Jersey

Backyard Winter Nature in New Jersey: Fresh Snow.

Afternoon walkabout with a macro lens. Fresh snow on red holly berries and fall leaves.

Red Holly Berries with Fresh Snow. Winter in New Jersey. Image taken with a Nikon D3 and 200 mm f/4 macro lens (ISO 200, f/8, 1/60 sec) (David J Mathre)
Red Holly Berries with Fresh Snow. Winter in New Jersey. Image taken with a Nikon D3 and 200 mm f/4 macro lens (ISO 200, f/8, 1/60 sec) (David J Mathre)
Fresh Snow on Leaf. Winter in New Jersey. Image taken with a Nikon D3 and 200 mm f/4 macro lens (ISO 200, f/5.6, 1/60 sec) (David J Mathre)
Fresh Snow on Leaf. Winter in New Jersey. Image taken with a Nikon D3 and 200 mm f/4 macro lens (ISO 200, f/5.6, 1/60 sec) (David J Mathre)

Sunday (03-February-2008) — Colorado

Outdoor Winter Nature in Colorado: Rocky Mountain National Park.

The sky was clear, so drove from Boulder to Rocky Mountain National Park. The roads in the park are open, so I spent another day taking pictures in this great National Park. It is cold, and the river is frozen. I am getting good use out of my Golden Eagle Pass.

Winter, Rocky Mountain National Park, Colorado. Image taken with a Nikon D3 and 14-24 mm f/2.8 lens (ISO 200, 24 mm, f/11, 1/640 sec) (David J Mathre)
Winter, Rocky Mountain National Park, Colorado. Image taken with a Nikon D3 and 14-24 mm f/2.8 lens (ISO 200, 24 mm, f/11, 1/640 sec) (David J Mathre)

Saturday (02-February-2008) — Colorado

Outdoor Winter Nature in Colorado: Lily Lake in Rocky Mountain National Park.

During a winter visit to Lily Lake in Rocky Mountain National Park, I observed these two folks out in the middle of the frozen lake. What do you think that they are doing? To give you a hint, they are not ice fishing, but it does have to do with fish under a frozen lake. Please reply if you think you know what they were doing.

Winter Under Ice Dissolved Oxygen Level Measurement at Lilly Lake, Rocky Mountain National Park, Colorado. Image taken with a Nikon D3 and 24-70 mm f/2.8 lens (ISO 200, 70 mm, f/11, 1/125 sec) (David J Mathre)
Winter at Lily Lake, Rocky Mountain National Park, Colorado. Image taken with a Nikon D3 and 24-70 mm f/2.8 lens (ISO 200, 70 mm, f/11, 1/125 sec) (David J Mathre)
Winter Under Ice Dissolved Oxygen Level Measurement at Lilly Lake, Rocky Mountain National Park, Colorado. Image taken with a Nikon D300 and 300 mm f/2.8 lens (ISO 200, 300 mm, f/8, 1/500 sec) (David J Mathre)
Winter at Lily Lake, Rocky Mountain National Park, Colorado. Image taken with a Nikon D300 and 300 mm f/2.8 lens (ISO 200, 300 mm, f/8, 1/500 sec) (David J Mathre)