超广角镜头
![19mm/2.8 超广角镜头](/Images/godic/202502/18/Leitz_Elmarit_R_191618.jpg")
超广角镜头是指能摄取比广角镜更阔的镜头，但不是鱼眼镜，一般焦距为12mm-24mm（135制式）
其视角非常广阔，景深较长，通常被摄影师用于拍摄风景照片，亦会用于拍摄近景以表现辽阔之透视效果，唯需注意主体置于左右两方时之变形，以免出现不协调情况。
Ultra wide angle lens
中文百科
英语百科
Ultra wide angle lens 超广角镜头
![Curvilinear (above) and rectilinear (below) image. Notice the barrel distortion typical for fisheye lenses in the curvilinear image. While this example has been rectilinear-corrected by software, high-quality wide-angle lenses are built with optical rectilinear correction.](/Images/godic/202502/18/Panotools56181618.jpg")
![Bearing 8/3.5 fisheye. A capture of an entire scene, including the sun is shown (180-degree circular fisheye). The underside of the seagull is illuminated by flash](/Images/godic/202502/18/Foto-wiki-Peleng-Sky-Sun-11618.jpg")
![How focal length affects perspective: 18mm (ultra wide-angle), 34mm (wide-angle), and 55mm (normal lens) at identical field size achieved by different camera-subject distances. Notice that the shorter the focal length and the wider the angle of view, perspective distortion and size differences change.](/Images/godic/202502/18/Focal_length1618.jpg")
An ultra wide-angle lens is a lens whose focal length is shorter than the short side of film or sensor.
Thus the term denotes a different range of lenses, relative to the size of the sensor in the camera in question.
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