A unique pattern in orange

I find it remarkable that certain plants can live in the harshest of environments. The shores of Hudson Bay in Manitoba, Canada are subject to extreme cold, brutal wind, and minimal sunlight, and yet plants like this orange crustose lichen (Caloplaca elegans) thrives. I found this particularly interesting circular pattern and filled the frame with the design. I stood above the lichen so the back of the camera was as parallel as possible to the plane of the rock to help create complete depth of field. Note the image is sharp from corner to corner with no focus fall-off. It is particularly important to use parallelism with a telephoto lens if you want depth of field. In the cold and wind, I didn't want to change lenses, so I used the 500mm telephoto with which I'd been photographing bears. My settings were 1/800, f/10, and 2000 ISO.