The Opmi 11 is a great microscope for ENT surgery in the OR. It is capable of accommodating simple tubes as well as more advanced procedures. The Opmi 11 provides 5-step magnification, fine focus, a larger diameter objective lens and widerfield eyepieces. This configuration offers a single, fiberoptic lightsource with a mercury switch for on/off. Features: • Smooth Fine-Focus Adjustment • Fiberoptic Illumnation with Mercury Switch • Durable Metal Components • Compatible with all various mounts