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Donuts

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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.


Product Name A B C Cat. #
S4, SL, SH, PC*  (3 3/16" center hole) 6 1/4” 6 1/4” 3 3/16” 2250
S4, SL, SH, PC* (2 1/2" center hole) ** 6 1/4” 6 1/4” 2 1/2" 2260
6” Ellipsoidal, S4 Zoom 7 1/2” 7 1/2” 3” 2200
S4 10°, SL 10° 12” 12” 6” 2252
S4 5° 14” 14” 7” 2251
SL 5° 16” 16” 7” 2258
S4 Mini  2.76" 2.76"  2.3" 2575 
S4 Mini White  2.76"   2.76"  2.3"  2575W 
125mm  125mm 125mm 81mm 2208
185mm  185mm 185mm 81mm 2210

*Source Four, Strand SL, Shakespeare, Pacific (19-50°)

**Smaller aperture provides shaper image but less brightness. 

Features


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

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2250_Donut_3_316_Center_Hole_6_14_S4_SL_SH_PC_Black_MED




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