IDAS Nebula filters cause a significant contrast enhancement and therefore enable longer exposure times with DSLRs, Color, and Mono Astro Cameras. As more and more "easier to filter" sodium vapor street lights are replaced with white LED street lights, light pollution has gotten all the more tricky to deal with.
The IDAS LPS-D2 filter is the IDAS answer to this new threat. It targets heavily the strong blue component present in these lights, as well as eliminating the warmer part of their emission curve from about 555nm to 640nm.
The filter is optimized for use with one-shot color cameras. The transmission spectrum is carefully designed to keep the color balance of images intact.