Adopting parallel light and infinity focusing Excellent optical design features long working distance, with no field curvature and monochromatic aberration throughout the entire field of view. Flexible use: can be used with objective lens or laser focusing lens Can be used with APO objective lens or laser focusing lens Suitable for various microscopes Can be specially designed for near-infrared and near-ultraviolet wavelengths to meet the imaging requirements of special materials Multiple focal lengths available: 40, 100, 160, 600, etc. Maximum compatibility with 1" CCD