di880 模块

di880  模块

di880

针孔与相纸中央的距离近，与相纸四角的距离远，这种距离上的差异，导致曝光不平均，形成暗角，特别是广角型的针孔相机，暗角尤其明显。

解决方法之一，是放置相纸的时候，把相纸卷曲成椭圆面。这样，针孔与相纸的中央的距离与相纸四角的距离接近，从而使相纸中央与四角的曝光一致。

另外，制作针孔的材料越厚，暗角越明显。可以选择一些较薄的材料制作针孔，例如铝箔，厚度只有0.012mm至0.015mm。

使用减光棒（dodging tool），也可以暗角。

di880 

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