ETC Source Four Compatible Donut

ETC Source Four Compatible Donut

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  • Description
  • Features
  • Specifications

Donuts are used in the colour 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.


The ETC Source Four Jrn/Fixed Compatible Donuts are also suitable for use with:

  • Selecon Pacific Ellipsoidals (19-50 Degree)
  • Strand SL
  • Shakespeare

The ETC Source Four Zoom Compatible Donut is also suitable for use with:

  • 6” Ellipsoidal

  • Used to help bring templates into perfect sharpness
  • Durable black powdercoat finish
  • Fabricated from light gauge steel

Name A B C Cat. #
ETC Source Four Jrn/Fixed Compatible Donut (3 3/16" Centre Hole) 6 1/4” 6 1/4” 3 3/16” 2250
ETC Source Four Jnr/Fixed Compatible Donut (2 1/2" Centre Hole) 6 1/4” 6 1/4” 2 1/2" 2260
ETC Source Four Zoom Compatible Donuts 7 1/2" 7 1/2” 3” 2200