Athabasca ND4 Filter provides a convenient way to maintain exposure control by reducing the amount of light entering the camera by 2 stops.  ND4 filter allows for many special effects such as being able to control depth of field by using a wider aperture or create or control motion blur by being able to choose just the right slower shutter speeds for perfect blurring. 

This is an especially useful tool when creating motion blur in moving water such as waterfalls, rivers and crashing waves. Other examples of good times to use very slow shutter speeds to create blur are; moving vehicles, trains, cars and congested city traffic; blurred panning effects where the subject, a runner, bicyclist or car is clear but the background around it is blurred from the camera following its movement 

Neutral Density filters in general have these main uses: 

• Slow down shutter speed for motion blurring effects like waterfalls, cars or blurred panning movement to make the subject stand out from the background. 
• Allow wider apertures to be used to decrease depth-of-field, literally focusing more attention on the subject. 
• Allow higher ISO films to be used in brighter lighting conditions 
• Allow cine/video cameras, which have a fixed shutter-speed range, to film on brighter lighting conditions such as the beach or in snow on a sunny day. 

For best results we recommends using a tripod when photographing with slow shutter speeds.

 Before and after applying ND4 filter

Slim Frame
Made out of environmentally oxidized aviation aluminium. Specially design for DSLR and digital cameras with thin filter frames (3.47mm) to help avoid vignetting on super wide angle lenses are also designed to hold a lens cap.

High quality optical glass 
Athabasca ND filter uses the highest quality Japan made optical glass, which creates a smooth, clear image.