The Cavision 4 x 5.65" Neutral Density (ND) 1.2 Filter has several uses and offers the possibility to achieve otherwise unachievable results. It enables the shooter to adjust exposure without affecting color balance. ND filters appear gray and reduce the amount of light reaching the film.
Determining which neutral density filter yields ideal results for any given lighting situation takes knowledge, experience and a collection of such filters. Speaking generally, the 2-stop value (ND 0.6) effectively compensates average situations.
Cavision is a Canadian company specializing in quality filters for film, broadcast and video productions. They also produce a variety of equipment including 3 x 3" and 4 x 4" matte boxes, boom poles and wide angle attachments for TV cameras.
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
Neutral Density Factors
- ND.3 (exposure adjustment = 1 stop, reduces ISO to 1/2)
- ND.6 (exposure adjustment = 2 stops, reduces ISO to 1/4)
- ND.9 (exposure adjustment = 3 stops, reduces ISO to 1/8)
- ND1.2 (exposure adjustment = 4 stops, reduces ISO to 1/16)
- ND1.5 (exposure adjustment = 5 stops, reduces ISO to 1/32)