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单反相机的结构决定了它在使用时,不得不面对一个大敌——灰尘。由于单反相机在更换镜头时会将反光镜箱暴露在外,无所不入的灰尘会由此进入相机内部,落在感光元件上。当光圈全开或较大时,这些灰尘一般不会对成像有太大影响,因为此时光线射入的角度足够大,感光元件表面和灰尘之间的距离也足够大,足以使灰尘无法在焦平面上留下阴影。而当光圈缩到很小的时候(一般在f/11及更小),灰尘就会在拍摄画面上形成脏点。因为此时光线入射角度小,几乎垂直入射,会导致灰尘在感光元件上留下阴影,从而在画面中清楚地显现出来。目前各相机厂家都开发了自己的数码单反除尘系统,以帮助用户解决灰尘之忧。今天我们就来实际测试一下哪种除尘系统最有效。
The structure of the SLR camera determines it in use, had to face a big enemy - dust. Because the SLR camera lens box will be exposed in the replacement of the lens, ubiquitous dust will thus enter the camera, falling on the photosensitive element. When the iris is fully open or large, these dusts generally do not have a significant impact on the imaging because the angle at which the light is incident is large enough that the distance between the surface of the photosensitive member and the dust is large enough to render the dust unattainable Focal plane to leave a shadow. When the aperture is reduced to a very small (usually f / 11 and smaller), dust will form a dirty spot in the shooting screen. Because at this time the light incident angle is small, almost vertical incidence, will lead to dust on the photosensitive element to leave a shadow, which in the picture clearly show. At present, all camera manufacturers have developed their own digital SLR dust removal system to help users solve the dust concerns. Today we come to actually test what kind of dust removal system is the most effective.