Cokin Filter Z121 Neutral Grey G2 (ND)8 (0.9)

Cokin Filter Z121 Neutral Grey G2 (ND)8 (0.9) | Control bright-light exposure

In strong daylight, a shutter speed can be too quick for the flowing-water look you want. The Cokin Filter Z121 Neutral Grey G2 (ND)8 (0.9) cuts the light reaching the camera, giving you room to use a slower shutter speed. Its ND8 rating corresponds to a three-stop reduction, while the 0.9 designation identifies its neutral-density strength. The grey colour is intended to reduce light without adding a colour tint to the scene. This filter suits photographers who want more control over exposure in bright conditions, especially when photographing moving water or other motion they want to render smoothly. It can also help when you want to use a wider aperture outdoors without letting in as much light. The main thing to plan for is the longer exposure: keep the camera steady to avoid unwanted movement in the rest of the frame.

Working with the light reduction

Use your camera’s meter to set an exposure without the filter, then account for the three-stop reduction. For example, a metered shutter speed of 1/8 second becomes about 1 second with the filter in place, assuming the same aperture and ISO. That longer exposure can soften moving water, while a tripod helps keep stationary parts of the scene sharp. The filter’s neutral-grey description points to its role: reducing light rather than adding a deliberate colour effect.

Technical Specifications

• Colour: Grey
• Filter type: Neutral-density (ND) filter
• ND rating: ND8
• Density: 0.9