Tag: Bullfrog

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)

Tuesday (03-July-2012) — New Jersey

Summertime Nature in New Jersey. Sourland Mountain Preserve.

Kermit the Bull Frog in a Pond. If you look close there is a mosquito below the eye. The resolution with the D800 camera is amazing.

Kermit the Bull Frog in a Pond in the Sourland Mountain Preserve in New Jersey. Image taken with a Nikon D800 and 300 mm f/2.8G VR lens + TC-E III 20 Teleconverter (ISO 360, 600 mm, f/5.6, 1/320 sec). (David J Mathre)
Kermit the Bull Frog in a Pond in the Sourland Mountain Preserve in New Jersey. Image taken with a Nikon D800 and 300 mm f/2.8G VR lens + TC-E III 20 Teleconverter (ISO 360, 600 mm, f/5.6, 1/320 sec). (David J Mathre)

21-October-2011

Day 4 and Counting

My Drobo disk-array is rebuilding after adding a new drive. Don’t know how long it will take. New images (including a meteor caught last night with two cameras) to follow. The down side to large storage solutions such as Drobo is the time required for backup and restore. Not sure if this will be hours or days!!!!

I did post some images on Google+ for the following themes: #FloralFriday 
#FrogFriday  #FungusFriday  #FallFriday  #FlowingWaterFriday

For a list of all of the Daily Google+ Photography Themes

Also, check out my post from 5 years ago today of a Doe and her two fawns in my backyard: 21-October-2006

Friday (01-July-2011) — New Jersey

Early Summer Nature in New Jersey. Sourland Mountain Preserve.

Morning Walkabout at the Sourland Mountain Preserve. Bullfrogs in the Pond.

Bullfrog at the Sourland Mountain Reserve. Image taken with a Nikon D3s and 70-200 mm f/2.8 VR lens + TC-E III 20 teleconverter (ISO 400, 400 mm, f/5.6, 1/100 sec). Raw image processed with Capture One Pro, Focus Magic, and Photoshop CS5. (David J Mathre)
Bullfrog at the Sourland Mountain Reserve. Image taken with a Nikon D3s and 70-200 mm f/2.8 VR lens + TC-E III 20 teleconverter (ISO 400, 400 mm, f/5.6, 1/100 sec). Raw image processed with Capture One Pro, Focus Magic, and Photoshop CS5.
Bullfrog at the Sourland Mountain Reserve. Image taken with a Nikon D3s and 70-200 mm f/2.8 VR lens + TC-E III 20 teleconverter (ISO 400, 400 mm, f/5.6, 1/500 sec). Raw image processed with Capture One Pro, Focus Magic, and Photoshop CS5. (David J Mathre)
Bullfrog at the Sourland Mountain Reserve. Image taken with a Nikon D3s and 70-200 mm f/2.8 VR lens + TC-E III 20 teleconverter (ISO 400, 400 mm, f/5.6, 1/500 sec). Raw image processed with Capture One Pro, Focus Magic, and Photoshop CS5.