Butterflies photographed at the Butterfly Pavilion in Westminster CO.

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Photos taken in June 2026 using an OM-1 Camera and OM 50-200 F2.8 lens at 200mm, handheld. These are high ISO shots because the light levels were low and significant noise reduction and sharpening were applied using LR Classic.

Tentative identifications of the butterflies were obtained using Google Lens software.

Clipper Butterfly

Green Peacock Swallowtail

Rice Paper Butterfly

Small Postman Butterfly

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David Sparks

I retired in 2005 after 40 years of research and teaching at the University of Alabama in Birmingham (24 years), the University of Pennsylvania (8 years) and the Baylor College of Medicine (8 years). Photography is my retirement hobby.

Nature photography, especially bird photography, combines a number of things that I really enjoy: bird-watching, being outdoors, photography, travel, messing about with computers, and learning new skills and concepts.  I now spend much of my time engaged in these activities.

David Sibley in the preface to The Sibley Guide to Birds wrote "Birds are beautiful, in spectacular as well as subtle ways; their colors, shapes, actions, and sounds are among the most aesthetically pleasing in nature."  My goal is to acquire images that capture the beauty and uniqueness of selected species as well as images that highlight the engaging behaviors the birds exhibit.