The Pronto is a long-lived series of leaf shutters made by the German company Gauthier based in Calmbach.
Pronto shutters have 25, 50, 100, B, T speed settings.
- Shunkan o torae-tsuzukeru shattā-ten, p. 6.
- Kamera no mekanizumu sono I: "Hai! Chīzu" Shunkan o torae-tsuzukeru shattā-ten (カメラのメカニズム・そのⅠ・「ハイ！チーズ」瞬間をとらえ続けるシャッター展, Camera mechanism, part 1 "Cheese!" Exhibition of instant taking shutters). Tokyo: JCII Camera Museum, 2002. (Exhibition catalogue, no ISBN number)