フォーカルプレーンでしょう
fōkaru purēndeshō
1. Probably focal plane.
Noun
1. Probably focal plane.
1. plain
1. it seems; I think
2. right?; don't you agree?
1. plane
1. plain yogurt; plain yoghurt
1. plain omelet
1. space plane
1. ultralight model plane for indoor use
1. plain knot
1. plain text