10-August-2012

Bullfrog at Sourland Mountain Preserve.

I took the same image of this bullfrog using a Nikon D4 and 400 mm f/2.8 lens. The camera and lens was mounted on a gimbal tripod. This version of the 400 mm lens does not have vibration reduction, but the heavy weight of the lens plus good long lens techniques minimized the impact of vibration due to mirror and shutter motion. The aperture was changed from f/2.8 to f/8 to see the impact on depth of view. The following are significant crops of the original images.
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Bullfrog in a Pond. Summer Nature at the Sourland Mountain Preserve. Image taken with a Nikon D4 and 400 mm f/2.8 lens (ISO 100, 400 mm, f/2.8, 1/500 sec). (David J Mathre)
Bullfrog in a Pond. Summer Nature at the Sourland Mountain Preserve. Image taken with a Nikon D4 and 400 mm f/2.8 lens (ISO 100, 400 mm, f/2.8, 1/500 sec). (David J Mathre)

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Bullfrog in a Pond. Summer Nature at the Sourland Mountain Preserve. Image taken with a Nikon D4 and 400 mm f/2.8 lens (ISO 160, 400 mm, f/4, 1/400 sec). (David J Mathre)
Bullfrog in a Pond. Summer Nature at the Sourland Mountain Preserve. Image taken with a Nikon D4 and 400 mm f/2.8 lens (ISO 160, 400 mm, f/4, 1/400 sec). (David J Mathre)

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Bullfrog in a Pond. Summer Nature at the Sourland Mountain Preserve. Image taken with a Nikon D4 and 400 mm f/2.8 lens (ISO 280, 400 mm, f/5.6, 1/400 sec). (David J Mathre)
Bullfrog in a Pond. Summer Nature at the Sourland Mountain Preserve. Image taken with a Nikon D4 and 400 mm f/2.8 lens (ISO 280, 400 mm, f/5.6, 1/400 sec). (David J Mathre)

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Bullfrog in a Pond. Summer Nature at the Sourland Mountain Preserve. Image taken with a Nikon D4 and 400 mm f/2.8 lens (ISO 560, 400 mm, f/8, 1/400 sec). (David J Mathre)
Bullfrog in a Pond. Summer Nature at the Sourland Mountain Preserve. Image taken with a Nikon D4 and 400 mm f/2.8 lens (ISO 560, 400 mm, f/8, 1/400 sec). (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 in photography include the natural world, wildlife, landscapes, skyscapes, and seascapes. I have traveled to over 50 countries over the last 10 years, often on Semester at Sea voyages. While at home in New Jersey, I spend time on a home renovation project and expanding my wildflower garden/meadow.

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