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 ...

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 ...

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 ...

Featuring a spectrally flat region between 700 and 1,100 nm and a low coefficient of thermal expansion, Tech Spec NIR neutral-density filters are ideal for attenuating IR sources such as 1,064-nm ...

In the second part of this in-depth series, Neil Oseman demystifies the use of ND filters to control exposure. In the first part of this series, I explained the concepts of f-stops and T-stops and ...

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 ...