What is the purpose of the blue filter on the microscope? Thank you!

Professional microscope team, for your answer! Welcome to follow the Tencent microblogging "@ChinaMicroscope" Color filters are auxiliary parts of the microscope, reasonable selection can improve the imaging quality. Color filters have the following main roles: (1) with achromatic objectives using yellow-green filters, can make the maximum correction of aberration. (2) for compound achromatic objective, blue filters can be used; due to the shorter wavelength of blue light than yellow-green light, thus improving the resolution of the objective. (3) Reduce the intensity of the light source. New microscopes in addition to the commonly used yellow-green filters, there are one or more gray neutral density filters, can be used to attenuate the intensity of the incident light and does not change the other characteristics of the incident light. The best use of this kind of filter Inconel alloy in the glass to form an evaporation precipitation film, can be made according to the needs of different light transmission rate of the filter, its transmission rate can reach 80% to 0.001% varies.