also: ちょうしゃく
noun which may take the genitive case particle 'no'
Often used for photographic film, video, or other media that is longer than standard; can also describe anything notably long in physical length or duration.
この映画は長尺の作品で、上映時間が3時間を超える。
This movie is a lengthy work, with a running time of over three hours.
長尺のフィルムを使うと、より多く
Using long film allows you to take more photos.
長い is the general adjective for 'long'; 長尺 is more technical and often implies a longer-than-standard length, especially for media or materials.
Compound of 長 (long) and 尺 (measure, length). The reading じゃく is the go-on reading of 尺, while しゃく is the kan-on reading; both are used, but じゃく is more common in this word.