Vignetting - Shuhengenko

Japanese: 周辺減光 - シュウヘンゲンコウ
Vignetting - Shuhengenko
1 In optical systems such as camera lenses, the tendency for the amount of light to decrease and for the image to become darker as it moves away from the optical axis (the central axis of the lens) to the periphery. Peripheral light falloff. Peripheral light deficiency.
2. The phenomenon in which the brightness of the surface of the Sun decreases as you move away from the center to the periphery. The photosphere seen from Earth is made of translucent gas, and while the hotter layers inside can be seen at the center, only a shallow, cooler layer can be observed at the periphery.

Source: About Shogakukan Digital Daijisen Information | Legend

Japanese:
カメラのレンズなどの光学系において、光軸(レンズの中心軸)から周辺部へ離れるに従い光量が減り暗くなる性質のこと。周辺光量低下。周辺光量不足。
太陽表面の輝度が中心から周辺部へ離れるに従い減少する現象。地球から目にする光球は半透明のガスからなり、中心部ではより内部の高温の層を見通せるが、周辺部では浅い低温の層しか観測できないことによって生じる。縁辺効果。

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