One more rainbow, but in a rather different setting.
Canon EOS 400D (XTi) · Canon EF-S 18-55mm f/3.5-5.6
18 mm · 1/160 s · f/8 · ISO 100
Don’t get me wrong. Capturing this most interesting rainbow was great and worth it and all that rot, but the incredibly fast-approaching and pounding torrential squall which immediately preceded it, and caught us out in the middle of the beach, soaking us to the bone (“PROTECT THE CAMERA!”) will probably live on as the more memorable event of the day.