The new SZX16 is designed for advanced research and has a maximum numerical aperture of 0.30, producing a resolution of 900 line pairs per millimeter. The SZX16 provides the largest zoom ratio of any stereo currently (April 2006) on the market 16.4:1. With this zoom ratio combined with a series of parfocal objectives (0.5x,1x,1.6x & 2x) the SZX16 can take you from macro to micro viewing.