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This is only a single single lens, to be used with the camera module, it is an M12 lens.
The smaller the focal length, the larger the lens angle and the more serious the distortion.
The larger the focal length, the more step the lens angle and the smaller the distortion. Generally, when looking at a long distance, it is recommended to use a telephoto lens.
The default lens has a 650 filter, and you can add an 850 narrowband filter(Just look at the light in the upper and lower bands of 850, the daily light is invisible)And 940 narrowband filter(Just look at the light in the upper and lower bands of 940, the daily light is invisible)