Much of my photography involves "invisible light"--near infrared and ultraviolet that humans can't see, although some animals can. For various technical reasons, shooting in infrared is relatively easy, especially with a modified camera. Ultraviolet, however, is a spectrum of challenges, including how little ultraviolet light there is naturally, how insensitive commercial camera sensors are to UV, and the simple fact that glass blocks most UV. Special filters, specialty lenses or those that by chance happen to transmit enough UV, long exposure times, and processing challenges make shooting in ultraviolet a pain.

But the result--alien images in a chthonic palette that often show surprising detail both otherwise invisible or overlooked--make it worth it.