noun
focal plane
Technical term in optics and photography; refers to the plane where light rays converge to form a sharp image.
フォーカルプレーンシャッターは、フィルム面の直前で動作する。
A focal-plane shutter operates directly in front of the film plane.
Variant with interpunct, sometimes used for clarity in technical contexts.
Japanese equivalent of 'focal plane', used in more formal or academic contexts, while フォーカルプレーン is a direct loanword common in photography.
Borrowed from English 'focal plane'.