This is a 0.5X C-mount lens for Olympus microscopes. The lens adapts C-mount cameras with sensors in the 1/1.8" to 1/2.5" range, to Olympus BX, CX, MX, STM, SZX, IX, and GX series microscopes. Features Specifications : Power: 0.5X Sensor Compatibility: 1/1.8" to 1/2.5" Compatibility: Olympus BX, CX, MX, STM, SZX, IX, GX Series Microscopes Camera Mount: C-mount(1" / 25.4mm diameter) Microscope Mount: 42mm Manufactured under ISO 9001 Quality Control Standards Warranty: 1 Year