This is a panorama of 3 images, each of which is 3 images merged to form individual HDR's. The HDRs were created using Photomatix Pro and Tone Mapped using the Details Enhancer. The panorama was created using Photomerge in Adobe Photoshop CS4.
I knew the main rainbow had 2 bands when I took the photos, but looking at the images I see it has at least 4 full bands of consecutive colors! The secondary rainbow seems to just have the one band of colors. Enjoy!
Camera: Canon 5D Mk II
Lens: Canon 24-70mm f2.8L
Location: My driveway.