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1783-BMS12T4E2CGL
1783-BMS12T4E2CGL根据光的直线传播原理。物体反射的光线,通过针孔,在成像面形成倒立的影像。针孔与成像面的距离,称为焦距。
焦距越长,所成的影像越大。例如,焦距为75mm时,影像刚好覆盖4x5英寸的底片;焦距为150mm时,影像刚好覆盖8x10英寸的底片。
焦距越短,所成影像的暗角越明显。
一般而言,针孔越小,影像越清晰,但针孔过小,会导致衍射,反而令影像模糊。
需要注意的是,针孔相机的分辨率受到针孔直径的限制,针孔直径越小,成像的细节就越清晰,但光线通过的数量就越少,因此需要更长的曝光时间。相反,针孔直径越大,光线通过的数量就越多,但成像的细节就越模糊。因此,在实际使用中,需要根据需要的成像效果来选择合适的针孔直径。
1783-BMS12T4E2CGL
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