Cokin Z-Pro 121M Gradual Gray 2 (Neutral Density (ND4) Medium Resin Filter - Often it is necessary or desirable to balance the light intensity in one part of a scene with another. This is especially true in situations where you don't have total light control, as in bright contrasty landscapes. Exposing for the foreground will produce a washed-out, over-exposed sky while exposing for the sky will leave the foreground dark and under-exposed.
Cokin graduated gray ND filters are part clear, part neutral density. They allow the transition to be blended into the scene, often imperceptibly. A ND.6-to-clear, with a two stop differential, will generally compensate the average bright sky-to-foreground situation and is also the most popular density of the series.
The Z-PRO Series is recommended for focal lengths of 20mm onwards (in the 35mm format). This filter is made of CR39 Resin which is a reputable lightweight and unbreakable optical material also used for ophtalmic glasses.
Note: This filter measures 100 x 150mm (4 x 6") and fits the Cokin Z-Pro filter holder
The Cokin 121 Series of Filters Comes in Five Variations of Graduation
- Cokin 121 - 2 stop Graduated Neutral Density
- Cokin 121S - 3 stop Graduated Neutral Density (Soft)
- Cokin 121F - 3 stop Graduated Neutral Density (Full)
- Cokin 121L - 1.75 stop Graduated Neutral Density (Light)
- Cokin 121M - 1.75 stop Graduated Neutral Density (Medium)
Neutral Density Filters Have Four Main Uses
- To enable slow shutter speeds to be used, especially with high speed films, to record movement in subjects such as waterfalls, clouds, or cars
- To decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background
- To decrease the effective ISO of high speed film (above ISO 400) and allow it to be used outdoors in bright situation
- To allow cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes which could cause overexposure