What kind of lens is used in microscope?

Objective lens achromatic objective, flat field achromatic objective, compound achromatic objective, compound achromatic best, eyepieces divided into wide-angle eyepieces, flat-field eyepieces, flat-field eyepieces the best, the domestic lens is generally no specific brand, although the microscope has, but the lens is generally not, the lens is produced according to the national standard, are universal, general microscope manufacturers lenses are also purchased outside the complete set, like the production of automobile Company, not necessarily screws, mirrors, glass is a meaning of their own production. Imported, such as Japan's Olympus, Nikon, Germany's Leica, Zeiss, their lenses can not be universal, each screw mosquito specifications, focus are not the same, if it is to buy imported lenses need to know the brand, the domestic does not need to buy a domestic objective only need to multiply on the line to buy a domestic eyepiece in addition to knowing the multiplier also need to know the eyepiece inserted into the microscope end of the outer diameter is how much, the domestic has three specifications 23.1mm, 30.5mm, 30mm, know these insurance you can buy the right lens