Buchanan Studios Blog

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Archive for March 2012

Technical Photographic Term of the Week: Density

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Density is the opacity of a particular area of an image.  In a positive image (prints, transparencies, digital displays) a dark shadow would be said to have a high density. On a negative, bright highlights are described as having high densities. Density is sometimes used to describe the overall exposure of a particular image (IE a light image would have low density.)

Written by stevebuchanan

March 28, 2012 at 10:19 am

Flying hot dogs?

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This weekend was Bennett’s pinewood derby. This year’s car below. While I think he had the coolest car out of the pack, the judges didn’t agree. It certainly wasn’t the fastest.  Next year though, less art, more speed!

pinewood, derby, car, hot, dog, hotdog, pine, wood, photo, cub, scout

 

Written by stevebuchanan

March 26, 2012 at 4:29 pm

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Photographic Term of the Week: Dynamic Range

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Dynamic range is the difference between the brightest and darkest portions of any given scene. Photographic systems have limited ability to capture dynamic ranges, therefore it is important to manage the dynamic range within a scene by manipulating lighting and/or composition.  For example… an scene lit with only sunlight on a clear day may have a dynamic range of 20 stops, which is beyond the range of currently available systems in a single exposure (multiple exposure HDR notwithstanding.) Therefore it will be necessary to alter the existing dynamic range of the scene by adding supplemental light or other methods of reducing the scenes native dynamic range – or accept the scene will have some areas that are too bright and/or too dark to be fully represented in the image.

Written by stevebuchanan

March 16, 2012 at 5:03 pm

Mean Greens

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So one downside to shooting overhead images is that you’re often working on the floor. If I’m shooting products it’s no big deal, but when shooting food it’s another story. But hey, the dog won’t eat kale will he? (um, yes he will)

kale, green, veg, vegetable, leaves, superfood, food, photography, saute, sauteed, sauted, pankale, green, veg, vegetable, leaves, superfood, food, photography, knife, boardkale, green, vegetable, dark, leafy, scan, scanogram, food, photography

Written by stevebuchanan

March 13, 2012 at 8:35 pm

Photographic Term of the Week: Depth of Field

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Depth of Field is the range of sharp focus within an image. Measured in distance from the focal plane, depth of field (of DOF) is affected by many factors. Key factors being…

1. Aperture (f/stop.)  The smaller the aperture (higher f/number) the greater the depth of field, or more in focus.
2. Focus Distance. The farther the primary focus distance, the greater the depth of field.
3. Focal length of lens. The shorter the lens (lower focal length) the greater the depth of field.

By manipulating these factors the photographer can adjust the depth of field to suit their needs.

Many lenses have a printed DOF scale on the lens barrel to aid the photographer in determining how deep the field of focus will be. It’s worth noting, however, that there is no agreed upon standard for what constitutes sharp focus. Therefore scales will differ from manufacturer to manufacturer. Further complicating matters is the fact that in today’s world of different digital sensors within the same platform of lens mounts, a DOF that may have been acceptable with one camera body, may not be on another higher resolution body. Nonetheless, the optical principals of DOF remain the same across all lenses.

Written by stevebuchanan

March 2, 2012 at 12:23 pm