When frequency is 301p/mm, the modulation transfer function(MTF) is near diffractive limit under 0.5 field angle, the modulation transfer function (MTF) is near 0.7 in edge field.

• 频率为301p/mm时系统的光学传递函数在0.；5°视场角以下接近衍射极限；边视场角的传递函数系数接近0