[yoyobobo]

CPL前面可轉動有什麼用途,環上有一個箭咀有什麼用呢？請高人指導一吓妹.

[BFCY]

When you are turning the front part, you will see from the viewfinder or LCD either 1) the sky or tree changing from more blue/green to less blue/green (or vice versa) under sunlight, 2) unwanted reflection from water/glass disappear.

CPL is used to block the unwanted light / reflection from passing through the lens and to the film/CCD/CMOS.

That's all I know based on my limited knowledge.

[bhcs3867]

環上的箭咀是指向太陽的方向。

[yoyobobo]

thanks bhcs 3867 & BFCY