The extension tubes are fun, allowing me to get better closeups. I shot most of these images with the 20mm extension tube, and used the SB-800 flash to make up for the higher f/9 setting. ISO 200 for all images. My first subject was the Tuxedo Urchin. I like the shape, the blue pattern between the spines, and how much he moves around. I took a number of pictures to see close up what he's made of. This first image is the uncropped version. The second image is a crop and shows a tiny ...