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Navitar EX Instruction Manual
Also see for EX: Brochure
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29Glossary of TermsColor Rendering Index (CRI) A rating system thatdescribes the effect of a light source on the color ap-pearance of objects (compared to a standard referencesource of the same color temperature). A rating of 100 isthe highest possible CRI. Typical cool white fluorescentlamps have a CRI of 62. Lamps with rare-earth phos-phors can have a CRI of 80 or higher.Color Temperature The color a light source appears tobe, ranging from reddish (lower color temperatures) tobluish (higher color temperatures). Measured in degreesKelvin (ºK).Diffused Light Produces a soft light with soft shadowswhile illuminating a relatively large area. Illumination isindistinct rather than obvious, distinct light beams.Fill Light Supplementary illumination positioned toreduce or eliminate shadows created by key light.Flare Over-saturation of light that appears when toomuch light is picked-up by a camera’s lens and reflectedoff its internal glass elements.Foot Candle (fc) A measurement of illumination whereone unit is equal to the light of a candle at a distance ofone foot.Glare A condition caused by light within the visible fieldthat is brighter than the level of light to which the eyesare adapted.Key Light The principal directional light. Usually posi-tioned off-center and angled towards the subject.Three-point Lighting A basic lighting method in whichkey light, fill light and back light are all used to illuminatethe subject while providing depth and texture. |
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