This is a set of 5 lenses with rings and handles for the Desisti Remington 575W HMI Par light. Each lens affects the dispersion and intensity of the light beam in its own way, when mounted to the fixture.
The Narrow Spot lens provides a beam of 9°. The Medium Flood lens: 17° x 10°. The Wide Flood lens: 42° x 17°. The Extra Wide Flood lens: 73°. The Frosted Fresnel lens: 41°.