This is an agama lizard I photographed in Namibia. I wanted to fill the frame with the reptile, but my 500mm f/4 Canon couldn't focus within 15 feet. If I took the picture from that minimum focusing distance, the subject would be too small in the frame and wouldn't have the visual impact I wanted. So I placed a 25mm extension tube between the telephoto and the camera body, and now I was able to shoot from a much closer distance and still have the lizard sharp. Fortunately it didn't move at all while I was adding the tube. I took the shot from about 8 feet, and the camera settings were 1/60, f/14, and 1000 ISO. I used a tripod because there is no way the picture would be sharp if I hand held such a heavy lens especially with this kind of magnification.
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