Dennis Goulet

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In The Yard — Pink Lady Slippers

Dennis August 4, 2012 Leave a Comment

In The Yard — Pink Lady Slippers

7D-8537 gaussian backgroundThis spring was a spectacular year for the lady slippers in my back yard.  There was one cluster of 20 flowers, with smaller plants of one to three flowers nearby.  The flowers are located on the edge of the forest, next to a pile of cut logs with a rack of firewood behind it.  Natural lighting can be difficult to deal with as the sun is low on the horizon sending shafts of light through the foliage of the trees.  Occasionally overcast skies provided flat light that reduces or eliminates harsh shadows on the flowers. It was an opportunity to try several techniques capturing these beautiful flowers, and I went out early each morning while the air was cool and still.  Once the sun starts warming the ground, air currents are created and even the slightest breeze results in significant movement in these large flowers on long stems.  I often used a 160 LED lamp to illuminate a single flower. Most images are captured with a Sigma 150mm lens on a Canon 5D Mark II.  I used tripod or beanbag for support and a wireless remote shutter release to avoid any movement during exposure. In addition to single captures of the scene, I made many captures with focus stacking in mind as well sets of images (a series of the same image at all f-stops) for use in teaching programs.  I also made a few images using a 50mm f/1.8 on the Canon 7D.

The first set of images were made by selectively focusing on different parts of the flower, then merging them into one image file using Helicon Focus stacking software.  Last year I had done quite a lot of image taking and analysis in an attempt to understand where focus stacking works and where it doesn’t. The extensive blog posts totaled 30 pages.  Helicon Focus recently had an update and added a new stacking algorithm which I used on a trial basis.  I was satisfied that it performed well on these image and purchased a one-year license ($30) for the Helicon Focus Lite.  I plan to reprocess the images sets I took last year to see if the new algorithm solve some of the problems I described in my posts last year.

The reason for using  a stacking program is to benefit from an extended depth of field at the subject while shooting at a large aperture to retain the soft out-of-focus (OOF) background.  The images are labeled as a single exposure or number of images stacked, and the f-stop used.

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To better see the effect of aperture on depth of field, images of a scene were captured at a various f-stops, and one image was constructed of several captures stacked together. The higher the f-stop (smaller aperture), the greater the definition in the background structure.  As the aperture is opened, the depth of field lessens and the background becomes a pleasant, soft blur. Unfortunately, the wide aperture doesn’t capture much of the flower in sharp detail, which is where focus stacking can be of benefit.  Care must be taken in capturing images for focus stacking to ensure sufficient overlap in the regions of sharpness.  The technique doesn’t always work cleanly, and in some cases there are artifacts that require a lot of editing to correct, if they can be corrected at all.

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Filed Under: All Posts, Backyard, Featured, Flowers Tagged With: Flowers, Stacking

Costa Rica 2011 The Art of Biodiversity – Part 4

Dennis August 3, 2011 1 Comment

Costa Rica 2011 The Art of Biodiversity – Part 4

Bosque de Paz Ecolodge

This small lodge, located in a valley between the Poas Volcano and Juan Castro Blanco National Parks offers a diversity of subjects to photograph. The owners, Federico and Vanessa González-Pinto are working hard, and succeeding in, developing an ecological corridor linking the two nationally protected areas.  They are amiable hosts and are truly concerned for the nature of Costa Rica.  In addition to the variety of landscape opportunities of the cloud forest moss-covered trees and rushing streams, the place is teeming with hummingbirds.  There is also an extensive collection of orchids located near the main building that hosts hundreds of orchids, and the owners sponsor orchid research supporting preservation efforts. 

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Filed Under: All Posts, Amphibians, Birds, Costa Rica, Flowers, Hummingbirds, Landscape, Trip Reports Tagged With: Birds, Costa Rica, Flowers, Hummingbird, Insect, Landscape, Macro

Costa Rica 2011 The Art of Biodiversity – Part 3

Dennis July 21, 2011 1 Comment

Costa Rica 2011 The Art of Biodiversity – Part 3

Arenal Observatory Lodge 

Arenal is the country’s most active volcano, with continuous emissions of lava and incandescent pyroclastic flows since the beginning of the present active cycle in 1968.  In 2010 when I visited this location, the eruptions could be heard day and night roaring, coughing and spitting, but due to the low cloud cover, not seen. I did get a view of the pyroclastic flows through a break in the clouds for about 30 seconds one evening. The weather did cooperate this year with clear skies one evening and clear skies one morning during sunrise.  Unfortunately, the volcano stopped erupting to a great extent three months prior to our visit.  It was quiet.

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Filed Under: All Posts, Amphibians, Birds, Costa Rica, Flowers, Hummingbirds, Landscape, Reptiles, Trip Reports Tagged With: Amphibian, Birds, Costa Rica, Flowers, Frog, Hummingbird, Macro, reptiles

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