1. You need a low shutter speed(long exposure needed shot in dayligjt or continuous dynamic picture）
2. Shallow depth of field shot of need(at large aperture line, highlighting the effect by blurrring the background themes)
3. When you need to control the speed(in very bright outdoor environments, maintaining the right amount of exposure)
4. The need to prevent the camear overexposed(avoid using light microscopy imaging in the smallest aperture or exposure of the case appeared)

This density creates a darkening of the entire image, allowing you to photograph with a wider aperture or slower shutter speed than normally required.
By slowing your exposure time or increasing your aperture, you are able to control depth of field and convey movement more easily.
This filter is constructed from a high quality optical glass for high definition and clarity.
It is compatible with the 100mm Filter System, which is designed for use with most lenses and camera types.
This filter measures 4x 4" / 100 x 100mm.
The filter made of high-quality Optical glass;
Far in excess of the general optical material;
Light quality;
Impact resistant
Model: ZOMEI ND4
Stop Reduction: 10''
Glass Material: Imported glass
Size:100mm*100mm
Thickness:2mm
Eliminates overly bright, washed-out images. Balances exposures
Equally effective in color or black and white photography and does not affect the overall coloration of the image.

Package Include:
ZOMEI 100 X 100MM Glass ND4 square filter *1(filter holder not include)