Clear filters are a valuable tool for photographers working in harsh environments and are a wise addition to any photographer's kit. Positioned in front of the lens, they provide an extra layer of ...

Editor’s note: In this Design Idea (DI), contributor Bonicatto designs a digital filter system (DFS). This is a benchtop filtering system that can apply various filter types to an incoming signal. The ...

Digital signal processors (DSPs) continue to receive a great deal of attention in new product design. For example, digital filter design reflects the importance of understanding and using this ...

I turn the Rollei Astroklar light pollution filter to the night sky to see if its low-light city shots live up to its famous ...