13-106 25 mm Dia. Hoya ND-0.3 Absorptive Neutral Density Filter; OD 1.5 425-675nm

The 13-106 is a 25 mm diameter Neutral Density Filter, manufactured by Hoya and sourced from Edmund Optics. This filter is designed to reduce the intensity of light entering the optical system without altering its color composition. It is particularly useful in photography, videography, and other applications where controlling light intensity is crucial.

The filter boasts an Optical Density (OD) of 1.5, which corresponds to a transmission of 3.16% (1/OD) of the incident light. This specific OD value is suitable for moderate light reduction scenarios. The filter's spectral response is within the 425-675nm range, covering a significant portion of the visible light spectrum.

The 13-106 filter is made of absorptive material, which means it reduces light intensity by absorbing a portion of the light. This type of filter is known for its excellent color neutrality, as it does not introduce any color casts into the image.

The filter has a circular shape, a standard in many optical systems due to its ease of use and compatibility with various mounts. It has a thickness of 1.5mm, which is considered thin and helps minimize optical aberrations.

The front and back surfaces of the filter are coated with EDM 13-089, a coating that likely enhances the filter's performance and durability. The filter's geometry is that of a Thin Lens, which suggests a design optimized for minimal distortion and improved optical performance.