Uni Optics’s neutral-density filter, is a filter that reduces or modifies the intensity of all wavelengths, or colors, of light equally, giving no changes in hue of color rendition.

1、What are neutral density filters used for?

A Neutral Density filter allows a photographer to control the exposure in an image very easily. The filter stops light reaching the camera sensor, therefore allowing us to leave the camera with a higher aperture for a longer amount of time.

2、What is the purpose of a neutral density filter?

The purpose of a standard photographic neutral-density filter is to reduce the amount of light entering the lens. Doing so allows the photographer to select combinations of aperture, exposure time and sensor sensitivity that would otherwise produce overexposed pictures.

3、Can you stack lens filters?

Yes. Light will bounce back and forth between your filters, and leave haze and flare on your photos. If you must stack filters, try not to shoot towards any strong light sources. Personally I always use UV filters to protect my lens.

Common specification 

Dimensional Tolerance:±0.5mm

Surface Quality: 80-50 or better

Surface figure:  4-6 λ or better

Coating: Optional