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.[1]

The Seikosha-MXL is a variant equipped with the light value system, introduced in 1956 in #00 size only.[2]

Seikosha-MX in #00 size[]

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):

Seikosha-MXL in #00 size[]

Incomplete list of cameras (not all variants have a Seikosha-MXL):

Seikosha-MX in #0 size[]


  1. Dates: Shunkan o torae-tsuzukeru shattā-ten, p.9.
  2. 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)