The Taiwanese company STC Optical has created a slide-in filter for Canon and Nikon full frame DSLRs that can reduce light pollution in astrophotography. It's called the STC Astro-Multispectra Clip Filter.
Our sun can look very different in photographs depending on the wavelength of light you're trying to capture. Some photographs show the sun as a glowing white ball, while others capture hotter areas in a cold blue color. NASA recently took a collection of sun photos shot at different wavelengths and combined them into the beautiful photo collage seen above (here's a higher-res version).
Future generations of photographers may one day look back and wonder why we often blinded each other with painfully bright flashes of light for the sake of proper exposure.
NYU researchers Dilip Krishnan and Rob Fergus are working on a dark flash that eliminates the "dazzle" effect of regular flashes in a low-light room. They've created this camera rig that combines common infrared photography techniques with an ultraviolet flash that produces a dim purple glow instead.
The team placed an infrared filter on the lens of the Fujifilm S5 Pro, which is has a modified CCD sensor that specializes in IR and UV photography. To supplement existing UV light, the team created a modified filter on an external flash to emit only UV and IR wavelengths.