The Chauvet Pro 36 Degree Ovation Ellipsoidal HD Lens Tube – White is a fixed focal length lens tube for Ovation ellipsoidal fixtures and other standard ERS-style fixtures. It uses dual aspheric lenses to provide precise focus for crisp gobo projection. The lens tube includes an integrated gel frame holder and gel frame. It is constructed with high-precision HD optics in a rugged housing for touring, broadcast and theatrical production.