Copal EM-578MM
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The Copal shutter of Zenit APK and KM(Plus).
(†: http://www.zenitcamera.com/archive/misc/images/copal-em-578mm.jpg)
(†: http://www.zenitcamera.com/archive/misc/images/copal-em-578mm.jpg)
(†: http://www.zenitcamera.com/archive/misc/images/copal-em-578mm.jpg)