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 ...

The neutral density filter is indispensable for landscape photographers. SOPHISTICATED SLR CAMERAS with their array of lenses can do many things, but there are still situations where a photo can only ...

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, ...

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 ...

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 ...

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 ...

Since the 1800s, photo filters have been used to apply different effects to photographs. Nowadays, many of these filters are no longer relevant, due to the increasing capabilities of editing programs ...

Neutral optical density filter is often used in imaging or laser applications to avoid strong light damage to camera sensors or other optical components. ND filters absorb or reflect untransmitted ...

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 ...