Enhanced Definition Lens Tube
In November 2005, ETC released the Enhanced Definition Lens Tube (EDLT). The EDLT is designed to produce images from gobos and other focus-critical instrument accessories more clearly and accurately than with the standard lens barrels. The lenses in the tube are coated with an anti-reflective material and are machined to more exact standards than the standard Source Four lens. The EDLT also increases lumen output. It is available in 19, 26, 36 and 50 degree barrels.
Read more about this topic: Source Four
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