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Bitter and Blue

This image of a Bitterweed in the foreground and the Texas Bluebonnet in the background was taken at Pedernales Falls State Park near the Bird Blind where I photographed the Ruby-throated Hummingbird that I wrote about in yesterday’s post. A friend of mine was telling me about a photographer that uses his telephoto lens to photograph wildflowers. So, I decided to experiment with my telephoto lens. What I like about it was the depth of field and the bokeh (e.g. “soft” background) that the lens produced. I wrote about bokeh recently in a post titled Cardinalis Cardinalis.

Telephoto lenses (aka long lenses) have a shallower depth of field. A 50mm lens with an aperture setting at f/8 with an object 10 feet away has a depth of field of 6.3 feet.  A 100mm lens with the same aperture and focus distance has a depth of field of 1.42 feet. A 400mm lens with the same settings has a depth of field of 0.07 feet.  A very big difference. So if you want a very shallow depth of field think about using a telephoto lens.


This image was taken with my Canon EOS 7D Mark II using my Canon EF 100-400mm f/4.5-5.6 II Lens set on 400 mm. The camera was set on Aperture priority mode with the aperture set at f/6.3, shutter speed at 1/640th of a second and the ISO set at 400. This is a single image processed in Lightroom.

This image is best when viewed large. Click on the image to enlarge it. Also, you can access the profile for this flower by clicking here. Please use the section below to post your comments, questions or suggestions.

T. Kahler Photography
© 2016 T. Kahler Photography

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