Z-PRO 153 Gray Neutral Density (ND) 4x Resin Filter - Neutral Density filters have several uses and offer the possibility to achieve otherwise unachievable results. ND filters appear gray and reduce the amount of light reaching the film. They have no effect on color balance.
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 ophthalmic glasses.
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 situations
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
Neutral Density Factors
Cokin 152 (exposure adjustment = approx. 1 stop, reduces ISO to 1/2)
Cokin 153 (exposure adjustment = approx. 2 stops, reduces ISO to 1/4)
Cokin 154 (P series only; exposure adjustment = approx. 3 stops, reduces ISO to 1/8)
Z-PRO Gray Neutral Density (ND) 4x Filter
100 x 150mm (4 x 6"), 1.5mm thick
4x (2 stops)
Reduces ISO to 1/4
Reduce the amount of light reaching the film To use high speed film in bright ligh