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. Durable black powder coat finish.

Improves gobo projection
Slight reduction in brightness
6.25" Fixtures
- Altman Baby Zoom Ellipsoidal
- Altman Shakespeare
- ETC Source Four jr / jr Zoom
- ETC Source Four Lens Tube (Standard/EDLT) - 19°, 26°, 36°, 50° (except 50° LED-only EDLT)
- Selecon Pacific - 20°, 30°, 40°, 50°
- Selecon SPX
- Strand SL - 19°, 26°, 36°, 50°
7.5" Fixtures
- Altman 360Q
- ETC Source Four Lens Tube - 14°, 70°, 90°
- ETC Source Four Lens Tube (LED-only EDLT) - 50°
- ETC Source Four Zoom
- ETC XDLT Lens Tube - 26°, 36°, 50°, 70°
10" Fixtures
- ETC XDLT Lens Tube - 14°, 19°
12" Fixtures
- ETC Source Four Lens Tube - 10°
14" Fixtures
- ETC Source Four Lens Tube - 5°
- ETC XDLT Lens Tube - 10°
17.5" Fixtures
- ETC XDLT Lens Tube - 5°