3x3" (75mm) 85N9 Color Conversion Wratten 2 Optical Gel Filter - Using tungsten film in daylight will produce a bluish cast in the photograph. The 85 series will produce natural colors when shooting with tungsten film outdoors. A #85 filter will decrease the color temperature from 5500K to 3400K and produce slightly cooler results than an 85B.
This filter combines an 85 conversion filter with a Neutral Density .6 (two stops) filter.
Most Kodak gelatin filters are available in 3 x 3" (75 x 75mm), 4 x 4" (100 x 100mm), 6 x 6" (150 x 150mm), and 14 x 18" (350 x 450mm).
Wratten 2 Improvements
- More rigid/durable
- Easier to handle
- Color consistent today, and 6 months from now as well
- Wratten 2 Optical Filters are less sensitive to humidity, less prone to static cling
- Fingerprint removal is also easier
85 Series Color Conversion Chart
- An 85 decreases the color temperature from 5500-3400 degrees Kelvin
- An 85A decreases the color temperature from 5500-3100 degrees Kelvin
- An 85B decreases the color temperature from 5500-3200 degrees Kelvin
- An 85C decreases the color temperature from 5500-3800 degrees Kelvin
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
- ND.3 (exposure adjustment = 1 stop, reduces ISO 1/2)
- ND.6 (exposure adjustment = 2 stops, reduces ISO 1/4)
- ND.9 (exposure adjustment = 3 stops, reduces ISO 1/8)
- ND1.2 (exposure adjustment = 4 stops, reduces ISO 1/16)