CITY THEATRICAL DONUT FOR S4 SL SH AND PC
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Donuts are used in the color frame slot of an ellipsoidal reflector spotlight to sharpen gobo projections. Similar to the way the human eye sharpens focus when it squints, 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.
City Theatrical Donut for S4 SL SH and PC
For use with the following Ellipsoidals:
Pacific (19-50 degrees)
Features: Used to help bring templates into perfect sharpness
Durable black powder coat finish
Fabricated from light gauge steel
Dimensions: 6 1/4" x 6 1/4"Center hole: 3 3/16"