We continuously listen to and incorporate customer feedback and suggestions to improve the EO website. Is there something you liked or disliked? Please take a minute and let us know! If you leave contact information, we’ll be sure to respond.
Are you looking for technical support or have a sales-related question? Use any of our fast and friendly services to meet your needs: email sales or technical support, contact our regional offices, or chat live with us.
Neutral Density (ND) filters appear gray in color and reduce the amount of light reaching the camera's sensor. Since the transmission value only varies over a small percent in the visible, there is no effect on color balance. Instead of just stopping down the lens aperture due to high light levels, ND filters allow for wider apertures which can be used to decrease the depth of field. This allows the important information to be separated from the background. Compared to polarizing filters, ND filters are ideal for overall light reduction in cases of extreme light intensity. By stacking filters, it is possible to achieve other Optical Density (OD) values. All mounted filters can be threaded together with identical male and female threads on each mount. Optical Density exhibits an additive relationship; for example, stacking filters with OD values of 0.6 and 0.9 yields a resultant density of 1.5. The optical density is related to the transmission by the following equation: T = 10-D x 100 = percent transmission.
Copyright year, Edmund Optics Inc.
18 Woodlands Loop #04-00, Singapore 738100