Infinity color corrected optical system with high quality micro-technique presents super excellent micro-image at any observation. Wide-field high eye-point eyepieces and plan /achromatic objectives make the effect of observation more perfect. Anti-Fungus Optical System. Outstanding appearance design and ergonomics structure design long time use without feeling tired. With the design of security lock and safe limits it is much more secure stab- le. and can be kept for long. Various microscopic examinations can be fulfilled such as bright-field dark-field phase contrast fluorescence simple polarizing and so on.