Description
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.
6.25″ x 6.25″ size fits standard ETC Source 4 fixtures, ETC Source 4 JR, Strand SL, Altman Shakespeare, Altman Phoenix, Selecon Pacific, and others.
