The outer mirror tube can provide proper shielding of the telescope group, and isolate the light from directly illuminating the main reflector and the secondary reflector, so that the source of stray light is mainly limited to direct and scattered stray light from a small angle light source, because the optical system still has a design viewing angle The problem of direct light source outside the value. As mentioned above, these rays outside the viewing angle are not affected by the primary and secondary mirrors, and directly penetrate through the central hole of the primary mirror, and directly reach the focal plane. At this time, the most effective way to eliminate the direct effect of the light source is to add a light barrier to directly block these direct rays. Here the light barrier rudder can fully exert its function of suppressing stray light, especially for the light source at a large off-axis angle. The generated scattered stray light can be reduced by one to three levels of stray light energy after adding a light-blocking rudder.
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