The SIRUI P1836A 18Adeg-36Adeg Stepless Zoom Projector Lens is a precision lighting accessory designed to give photographers and filmmakers creative control over beam angle, focus, and light shaping-all in one compact, Bowens-mount-compatible unit. This projector lens attaches to COB lights (recommended for use with lights under 200W) and allows you to adjust the beam angle from 18Adeg to 36Adeg without swapping lenses. With a simple twist of the zoom ring, you can fine-tune the light&&';;s spread and focus, making it ideal for spotlighting, shaping shadows, and projecting patterns using included GOBOs and shutter blades. Features: Stepless Zoom Range: Smoothly adjust beam angle from 18Adeg to 36Adeg with one hand. Built-In Shutters: Four blades let you cut and shape the light precisely. GOBO Compatibility: Includes 15 GOBO patterns and a holder for creative projection effects. Color Filters: Red, yellow, and blue filters included for stylized lighting. Fan Cooling System: Magnetic, battery-powered fan helps dissipate heat during extended use. Bowens Mount: Compatible with SIRUI Blaze and CS Series monolights and other Bowens-mount COB lights. Compact & Durable: Aluminum alloy body with heat-resistant design; weighs just 1.7 kg (3.8 lbs).