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Canon 7D with Sigma 150mm lens, f7.1, 1/250, ISO 400
After a while the sun started to break through and the butterfly began to open its wings to warm them. Before long it decided to flutter a little further down the path before settling again. Fortunately, the sun kept going in which prevented the butterfly from warming up too much. As a result, whenever it settled it was still quite approachable but the breaks in the cloud at least allowed me to photograph the butterfly with its wings open.
Canon 7D with Sigma 150mm lens, f13, 1/200, ISO 200
Canon 7D with Sigma 150mm lens, f7.1, 1/400, ISO 200
Finally, I always carry my fisheye lens with me as I love to take 'wideangle macro' type shots showing an insect's environment. Such shots are very difficult to take (the lens was almost touching the butterfly!) but can be quite effective.
All in all, I was pleased with these images. I was at the site for less than 2 hours but managed to get the images I wanted. If only that happened more often....