The SZ51 and SZ61 microscopes , deliver images with superb depth of field as well as clarity, detail and true-to-life color and built in ESD protection. Their dependable, high-performance optics are central to producing consistent accurate results. SZ51/61 have zoom ratios of 5:1 and 6.7:1 (zoom range 0.8x-4x and 0.67x-4.5x) respectively and are affordably priced yet off the highest resolving power in their price range and are available with either 45 or 60 degree inclination angles for observation. Utilizing the Greenough optical design, all zoom bodies incorporate the latest aberration and distortion-free optics that set a new standard in optical quality while maintaining superior operability. The V-shape optical path ensures a slim zoom body – ideal for integration into other equipment or stand alone use.