Tunable filters are optical filters that are suitable for applications requiring wavelength tuning. Two of their main specifications are the optical density (OD) and the out-of-band rejection. The ...

Variable neutral density filters enable you to choose exactly how much light you want to restrict for your camera's sensor, allowing you to capture long exposures for effects that freeze movement, ...

If you are ever planning to shoot photography outside — whether it be a vibrant cityscape or gorgeous landscape — you will want to use a neutral density filter (or ND filter). An ND filter essentially ...

One feature I'd really like, the equivalent of a neutral density filter to better handle scenes with bright and dim patches, appears headed for Lightroom. Stephen Shankland worked at CNET from 1998 to ...

A quality ND filter (short for neutral density filter) cuts the amount of light coming into the camera without affecting the color or overall appearance of the image. While photographers often want ...

Sony’s latest software add-on is making HDR and graduated neutral density filters look a little old school. Launched today, Digital Filter is an app for Sony cameras designed to mimic the effect of ...

Fig 1. Density addition and subtraction can easily separate these audio channels before digitalization. Fig 2. Density multiplication can easily be used to multiply these two inputs in several ...