口こう径けい食しょく

noun

vignetting

In photography and optics, the darkening of image corners relative to the center, caused by lens design or obstruction.

• このレンズは開かい放ほう付ふ近きんで口こう径けい食しょくが目め立だつ。

  This lens shows noticeable vignetting near wide open.

• 口こう径けい食しょくを補ほ正せいするために、ソフトウェアで周しゅう辺へん光こう量りょうを上あげた。

  To correct the vignetting, I increased the peripheral illumination in software.