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image.lens_corr([strength=1.8[, zoom=1.0]]) 2.8mm的参数是1.8，那12mm镜头的参数默认值是多少？ 此外，设置畸变矫正后会影响运算速度吗？
长焦镜头不需要矫正畸变，
因为焦距越长，畸变越小。