1783-BMS12T4E2CGL

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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