The spherical illuminators work on the principle of an integrating sphere.A light source illuminates the interior of a sphere which is coated with a special white diffuse coating. A plane (measuring window) which is small compared to the diameter of the sphere and oriented perpendicular to the incident light is illuminated extremely uniform. Although the opening of our LE6 series is fairly large the integrating sphere, together with specific light guiding elements, ensure an illumination of more than 96% uniformity. A mechanical shutter allows to dim the light down to app. 1% of the max. illumination without changing the color temperature. The color temperature is 3200K +/- 50K. Available filters to change the color temperature see table below. The standard test chart size for the illuminators is our D280 format. D240S has the same slide format but a smaller picture format. Therefore it fits without an adapter. For the chart sizes D240 and D205 adapters are available.Please allow three weeks for delivery time on all Esser Charts.

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