48-528 12.5 mm Dia. Hoya ND-13 Absorptive Neutral Density (OD 0.9) Color Filter; t=2.5 mm 400-700nm

The 48-528 is a 12.5 mm diameter absorptive neutral density filter, manufactured by Hoya and distributed by Edmund Optics. This filter is designed to reduce the intensity of light entering the optical system without altering its color balance. The ND-13 designation indicates that it has an Optical Density (OD) of 0.9, which corresponds to a transmission of 12.5%.

The filter features a 2.5 mm thickness, which is relatively thin compared to other optical elements, making it suitable for applications where space is a constraint. It is designed to operate within the wavelength range of 400-700nm, covering the visible light spectrum.

The front and back surfaces of the filter are coated with the EDM 48-528 coating, which likely enhances the filter's performance and durability. The filter's shape is defined as a thin lens, suggesting that it may have some light-bending properties, although this is not explicitly stated in the provided data.

This filter is currently in stock and can be purchased directly from the Edmund Optics website using the provided catalog number.