There are bad optical aberration in the camera lens of short focus.
短焦距摄像机镜头一般都存在比较严重的光学畸变,使成像质量下降.
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The parabolic antenna fed with half - wave dipole , with circular disc short - focus parabolic reflector was studied.
研究了一种 半波 振子馈电的带圆片副反射面的抛物面天线.
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