The Cokin Filter Z072 Center Spot Wide Angle Grey 1 allows you to emphasize the centre of an image while darkening the surrounding area. The Z072 filter allows you to give your photos a more dramatic look.
Working with the Z072 Filter
The filter is directly affected by the aperture setting and the focal length. If you use a larger aperture, the filter will have a softer effect on the photo. The size of the circular area that is rendered sharp becomes larger when using a longer focal length. Exposure metering must be done without the filter attached to the lens. If your camera has spot metering, you do not need to remove the filter from the lens to determine exposure.