OptoSigma's Modular Zoom Microscopes are designed for high-resolution observation and feature continuously variable (rather than stepped) magnification.  The modular design means it can be set up like a standard upright microscope or integrated into a larger optical system in any orientation.  The zoom feature can be either manual or motorized.  Two types of zoom microscopes are available.  The first type, SIZM,  has an infinite conjugate design so it can be used with standard infinity-corrected objectives from OptoSigma or other manufacturers. A 50X objective, for example, will provide continuous magnification from 12X to 165X.  The second type, SZL, is specifically designed for use over long working distances, up to 500mm. This makes them particularly useful for observations within inaccessible locations such as high-temperature furnaces or vacuum chambers.  These microscopes are modular, allowing users to select the exact features and options needed for their application.  Additional modular components include objective lenses, light sources, digital cameras, motorized zoom controllers, and mounting adaptors.