Tuesday (10-July-2018) — New Jersey

Backyard Summertime Nature in New Jersey.

Kermit the Bullfrog in my pond. This one may be the alpha male since it didn’t dive to the bottom as soon as I walked near the pond.

Kermit the Bullfrog in my Pond. Image taken with a Fuji X-T2 camera and 100-400 mm OIS lens. (David J Mathre)
Kermit the Bullfrog in my Pond. Image taken with a Fuji X-T2 camera and 100-400 mm OIS lens. (David J Mathre)

Sunday (08-July-2018) — New Jersey

Summertime Nature in New Jersey.

I stopped at the nearby Sourland Mountain Preserve to see if any butterflies have arrived. I only found some really tiny butterflies (or are they moths?).  While walking down the gas line trail, I noticed a deer watching me from the bushes. It looks like she has a wound on her head between the eyes that was covered with flies. Back home, there was a wary groundhog, a bull frog in my pond, and a young fawn going through my wildflower garden eating the buds before they can bloom.



Individual images in the slide shows can be viewed here.

Three-Years Ago (02-July-2011) — New Jersey

Summer Nature in New Jersey. Sourland Mountain Preserve.

Kermit the Bullfrog in the pond at the local Sourland Mountain Preserve. Image taken with a Nikon D3x camera and 500 mm f/4 VR lens (ISO 400, 500 mm, f/4, 1/400 sec). Raw image processed with Capture One Pro, Focus Magic, Nik Define, and Photoshop CS5.

Kermit the Bullfrog at the Sourland Mountain Reserve. Image taken with a Nikon D3x and 500 mm f/4 VR lens (ISO 400, 500 mm, f/4, 1/400 sec). Raw image processed with Capture One Pro, Focus Magic, Nik Define, and Photoshop CS5. (David J Mathre)
Kermit the Bullfrog at the Sourland Mountain Reserve. Image taken with a Nikon D3x and 500 mm f/4 VR lens (ISO 400, 500 mm, f/4, 1/400 sec). Raw image processed with Capture One Pro, Focus Magic, Nik Define, and Photoshop CS5. (David J Mathre)

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)

Thursday (26-July-2012) — New Jersey

Summertime Nature in New Jersey. Sourland Mountain Preserve.

Bullfrog in a Pond at the Sourland Mountain Preserve. Recently there have been a lot of messages on the internet regarding some users of the New Nikon D800/D800e camera having issues with autofocusing. Specifically, that the left autofocus sensors are not focusing accurately. I tested my D800 camera with a test chart — comparing the CAM3500FX contrast based autofocus system with the Live View phase based autofocus system. I did not find any significant difference between right, left, and center contrast based autofocus, all being equivalent to the Live View based focus.

Rather than spending a lot of time testing each lens, I took the camera out to the local Sourland Mountain Preserve and took the following images of a Bullfrog. The images were taken with the D800 camera  and a 500 mm f/4 VRII lens. The lens was mounted on a tripod, and the images taken in “Mirror up” mode to minimize vibration. I was approximately 20 feet away from the bullfrog, which is near the minimum focus distance for this lens. The lens was wide open (f/4) which means a very narrow depth of field in sharp focus. I did the same shot with the head of the frog in the left, center, or right most autofocus sensor, each time re-focusing from infinity. If anything the image from the left sensor was the sharpest. I think the softness for the image from the right sensor is due to vibration.

Bullfrog in a Pond at the Sourland Mountain Preserve in New Jersey. Image taken with a Nikon D800 and 500 mm f/4 VRII lens (ISO 800, 500 mm, f/4, 1/800 sec). Crop of image taken with the left focus sensor. (David J Mathre)

Focused Using Left Sensor.

Bullfrog in a Pond at the Sourland Mountain Preserve in New Jersey. Image taken with a Nikon D800 and 500 mm f/4 VRII lens (ISO 800, 500 mm, f/4, 1/800 sec). Crop of image taken with the left focus sensor. (David J Mathre)

Focused Using Left Sensor (100% Crop)

Bullfrog in a Pond at the Sourland Mountain Preserve in New Jersey. Image taken with a Nikon D800 and 500 mm f/4 VRII lens (ISO 800, 500 mm, f/4, 1/800 sec). Center focus sensor. (David J Mathre)

Focused Using Center Sensor

Bullfrog in a Pond at the Sourland Mountain Preserve in New Jersey. Image taken with a Nikon D800 and 500 mm f/4 VRII lens (ISO 800, 500 mm, f/4, 1/800 sec). Crop of image taken with the center focus sensor. (David J Mathre)

Focused Using Center Sensor (100% Crop)

Bullfrog in a Pond at the Sourland Mountain Preserve in New Jersey. Image taken with a Nikon D800 and 500 mm f/4 VRII lens (ISO 800, 500 mm, f/4, 1/800 sec). Right focus sensor. (David J Mathre)

Focused Using Right Sensor

Bullfrog in a Pond at the Sourland Mountain Preserve in New Jersey. Image taken with a Nikon D800 and 500 mm f/4 VRII lens (ISO 800, 500 mm, f/4, 1/800 sec). Crop of image taken with the Right focus sensor. (David J Mathre)

Focused Using Right Sensor (100% Crop)