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Donut for a Selecon Pacific Fixed Lens

6.25" x 6.25" 

158 x 158 mm

Donuts are used in the color frame slot of an ellipsoidal reflector spotlight to sharpen gobo projections. A donut reduces the aperture and sharpens the output of the fixture. There is some reduction in brightness to achieve this increase in sharpness but this is often a tradeoff that designers are willing to make.