Exa thread mount Cameras - Taken from long gone website
(by VEB Pentacon, Dresden)
For Exakta and Exa cameras, see
http://www.geocities.com/Vienna/1244/home.html (GeoCities
closed, now Yahoo)
The following comments are courtesy of Bart Peeren :
(1) The exa's mirror acts as the first, opening, part of the shutter. The
second, closing part is a metal 1/4 cylinder. This whole assembly is returned to
its starting position when transporting the film. So, no instant return mirror!
(2) the m42 Exa's have only been made in very small quantities, the standard
being the Exakta Bayonet with external auto diaphragm.
Exa Ia, 1973-??
It appears that some Exa Ia were made with M42 mount starting from 1973.
Exa Ib, 1977-??
Waist level view-finder, interchangeable finders, detachable back
Shutter: 1/30, ??, 1/175, B
Flash: X-synch
Metering: none
Automatic diaphragm
No instant return mirror
Exa Ic, 1985-1992(?)
(in USA Exa Ic is a different camera)
Same as Ib, but all black with greater use of plastic