Tag Archives: HDR

Bosque del Apache NWR, New Mexico

I had the pleasure to lead a photography trip to this fabulous New Mexico birding hot spot for a few days in early December. Bosque del Apache NWR lies on the Rio Grande about halfway from Las Cruces to Albuquerque, NM. This National Wildlife Refuge is an amazing photography destination as it is the resting spot for migratory water fowl in late winter. The birds are there by literally tens of thousands, always an impressive sight! As it turned out, the weather was somewhat mild and photo perfect. I thought I would post a few images from the trip.

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One of nine thousand Sandhill cranes takes off in the early morning light. The birds slept overnight in a shallow pond right by the roadside. They would take off by ones and twos and in very large masses, often right over our head.

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With a wing span of six feet, Sandhill cranes are elegant fliers. They feed in dry fields during the day and return to shallow water at night. At Bosque del Apache the massive numbers of these large birds presented many photographic opportunities as well as a cacophony of sound as they vocalized to each other.

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Snow geese were everywhere! Frequently they would take flight in an explosive liftoff by the hundreds. Often, they would circle and come right back. Later, they may explode again and move to another field or other part of the refuge system.

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My good friend and photographer, Dolph McCranie with poster enumerating Bosque’s bird count for the time we were there. As you can see by the numbers, finding a subject was an easy task.

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A bobcat was a very lucky find. This cat was stalking a small group of Mallard ducks when I spied it near a small canal. A slow, careful approach resulted in a relatively nice image.

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After shooting birds, many of the group photographed other sights in and around Socorro, NM, like the interior of the Capitol Bar, one of the oldest in the Southwest and in business since 1896.

All images Nikon D2Xs and Nikkor optics including 600 mm F 4, 80-200 mm F 2.8, 28-70 F 2.8 and 15 mm F 3.5.

© Copyright Brian Loflin 2012. All rights reserved.

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Texas Spring

I believe this image is all about wildflower season in Texas. This photograph was taken at the entrance road into private ranch land just south of Llano, Texas, during the first week of April, 2012. This scenic vista is typical of the vegetation and topography found in “The Hill Country”. The area is predominant  oak-juniper woodland where ashe juniper, live oak, shin oak and mesquite are the dominant trees. Deeply dissected limestone hillsides, broad, undulating divides and stony plains establish biodiversity in this region. The soils are shallow and are frequently calcareous in origin. Limestone outcrops are everywhere, frequently presenting seemingly-impenetrable, solid limestone plates just inches under the surface.

But, as poor as the soils seem, The Hill Country supports one of the most spectacular explosions of colorful wildflowers that may be found. People travel from far and wide just to witness Wildflowers in Texas.

Nikon D2Xs, 28-70mm F2.8 Nikkor lens. Seven frame HDR image.

© Copyright 2012 Brian Loflin. All rights reserved.

Extreme Macro Depth of Field

Again and again, we have learned that there are several occasions where a single, yet well-executed, digital image may not capture the expected results. Most commonly we see High Dynamic Range images from a series of bracketed frames
providing greater tone values of a scene than possible with a single exposure.

Many pictorial images have a very wide Depth of Field range that somewhat limits the capability to capture front-to-back sharpness in a traditional digital image regardless of the aperture selected. We have also learned this DoF is dependent primarily on Aperture, then on Subject Distance, and lens Focal Length. As we get closer to the image in macro photography, the total measured distance of the DoF gets smaller. Therefore, we need to improve upon this fault.

Like in HDR, with the Extreme Depth of Field process we rely upon the blending of several images into one with greatly extended DoF. Each image is focused at a different distance from the lens. When blended in computer software, part of the resultant image uses near focus detail, part uses mid-focus detail and another uses far focus detail, and so on. Often, as many as 10 or more sequential images are “stacked” and blended into one.

This blending process can include the use of multiple layers in Photoshop or a free software called CombineZ. However, the most powerful software and today’s industry standard is Helicon Focus. The current version is 5.2.16 and its cost ranges from $30 to $200 depending on length of subscription service and number of computers licensed.

Nikon D2Xs, 50 mm flat field EL Nikkor lens on bellows, two SB-800 flashes, tripod. Image magnification in camera: 1.6X.

In this image of the head of a bee 53 individual images with a different point of focus from the antennae to the rear of the head were made. Each image was spaced 0.005 inch from one another from the front to the back. These multiple images spanned the overall distance of o.265 inch.

The screen shot above is from Helicon Focus. It illustrates the blending of these images into the resultant single Extreme Depth of Field image of the bee. The two images below demonstrate the difference in focus from one of the more front images to one of the most rear images. As illustrated, the DoF of any of the images is nil at this magnification.

A most helpful tool for capturing the many individual images required is a focus slider, a tripod mounted, rail-like device that facilitates the movement of the camera backward and forward at very small increments, thus changing the point of focus. (Moving the camera for focus is done as opposed to rotating the lens barrel normally which would change magnification at this scale.)

In my lab, the camera remains stationary and solidly mounted on a heavy tripod. I use a micrometer stage to move the specimen which provides infinite, yet measured travel over a distance of just more than one inch in measured intervals of 0.001 inch. This process proves most ideal when dealing with insects and other tiny specimens. This equipment set-up with a variety of macro lenses is capable of producing images up to 40X magnification. (See image below.)

Camera and bellows with focusing rail mounted on heavy tripod, specimen on micrometer stage, twin SB-800 on articulating arms with ball heads, auxiliary battery power for Speedlights, electronic cable release.

As in other high-magnification applications, any movement of the camera or subject is most detrimental to image quality. Therefore, solid mounting is paramount. Bolt everything down on solid, vibration-free surfaces. The heavier, the better. In addition, use an electronic cable release and mirror lock-up to minimize motion at every possible point.

The use of electronic flash with its inherent high speed flash duration is most helpful. This is especially true as at great bellows extension, a lot of light loss is encountered. Flash provides these high light levels required for appropriate exposures. As a side benefit, the use of high shutter speed synchronization will also help reduce image deterioration due to internal camera vibrations. As a rule, I generally use 1/250 to 1/500 second shutter speeds at ISO 100 with flash. With these settings I can use the “sweet spot” aperture of F8.0 for highest resolution.

Extreme Depth of Field techniques are exceptionally useful in macro, but the technique is not limited to macro images alone. Remember, DoF is affected
by aperture, lens-to-subject distance, and lens focal length. So you are able to use EDoF whenever given aperture and selected focal length precludes deep DoF.

Copyright © 2012 Brian Loflin. All rights reserved.

Primrose HDR made simple

Texas wildflowers are out and about. This is not a great year like last, but flowers abound if you search. One of the more common this week is the Showy primrose (Oenothera speciosa). It is not a spectacular flower, only about 2 in across.

To make this flower stand out in a photograph I decided to produce a simple HDR (High Dynamic Range) image with only two frames 1.0 F stop apart. The first was exposed on the money and the second, under exposed. Combined in Photomatix Pro 4.0.2 software, the resulting frame has more “pop” than the single frame.

With HDR photos of wildflowers windy conditions are a severe handicap. Wind breaks and high shutter speeds can help. However, making several images without movement is rarely possible. Therefore, it’s nice to know that a combination of only two images will still produce pleasing results.

Image capture with Nikon D2Xs and 200mm F4 Micro Nikkor lens in natural light.

© Brian Loflin. All rights reserved.