Which one has a smaller spot size, ZnSe plano convex lens or crescent lens?
At the same focal length and aperture, the spherical aberration of the crescent lens is small, and the edge of the light spot is cleaner; The diffraction limit of the central spot is determined by the aperture, and the t
Which one has a smaller spot size, ZnSe plano convex lens or crescent lens?
At the same focal length and aperture, the spherical aberration of the crescent lens is small, and the edge of the light spot is cleaner; The diffraction limit of the central spot is determined by the aperture, and the two are close.