The Seikosha-MX is a leaf shutter made by Seikōsha, the manufacturing branch of Hattori Tokei-ten. It is an evolution of the Seikosha-Rapid, with added MX synchronization. It appeared in 1955 in #00 size and in 1956 in #00 size.
Seikosha-MX in #00 size
|Seikosha MX Shutter from a Kalloflex|
image by Hans Kerensky (Image rights)
Only known with B, 1, 2, 5, 10, 25, 50, 100, 200, 500 speeds.
Incomplete list of cameras (not all variants have a Seikosha-MX):
- Arco 35 Junior by Arco
- Arco 35 Automat f/3.5, f/2.8 and D by Arco
- Kalloflex Model 2 by Kowa
- Olympus Flex A3.5 II by Olympus
- Pearl IIIMX by Konishiroku
- Primoflex Automat by Tōkyō Kōgaku
- Samocaflex 35 II by Samoca
- Auto Terra by Teraoka
- Auto Terra II and Auto Tera IIB by Teraoka
Seikosha-MXL in #00 size
Incomplete list of cameras (not all variants have a Seikosha-MXL):
- Arco 35 Automat D by Arco (late prototypes only)
- Pearl IIIL and Pearl IV by Konishiroku
- Primoflex Automat L by Tōkyō Kōgaku
- Primo Jr and Sawyer's Mark IV by Tōkyō Kōgaku
- Auto Terra IIBS and IIL by Teraoka
Seikosha-MX in #0 size
- Dates: Shunkan o torae-tsuzukeru shattā-ten, p.9.
- Shunkan o torae-tsuzukeru shattā-ten, p.10.
- 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)