noun
fixed focal length lens; prime lens
Photography term for a lens with a single, non-zoomable focal length. Often contrasted with ズームレンズ.
単焦点レンズはズームレンズより軽くて明るいものが多い。
Fixed focal length lenses are often lighter and brighter than zoom lenses.
ポートレート撮影には50mmの単焦
A 50mm prime lens is popular for portrait photography.