Without a doubt, Olympus is the hands-down winner of the half-frame prize. It produced more half-frames -- called "Pens" -- in more styles, with more features, over a longer period of time than anyone else. And if you want to get the definitive guide to the viewfinder cameras in the series, check out:
(1960-1967) As with the original model there are different versions of the Pen S. The lens is what varies from model to model. The speeds were B, 1/8 - 1/250 on all models. The first model (1960-1964) was nearly identical in appearance to the original Pen but it had a slightly longer 30mm (f2.8 - 22), focusing lens -- 2 feet to infinity. Another version has a 28mm (f3.5-22) focusing lens (2 feet to infinity). All of these models say Pen S on the front. They all have a PC connection, cold flash shoe, tripod socket, and cable relaese connection. No meter. Available in black and chrome versions
(1964-1965) Since this model sold for only two years, it is one of the more unusual models. It is basically the same as the Pen S, but had a slightly wider-angle, six-element, 25mm (f2.8 - 22) manually-focusing lens. Focus was from 2 feet to infinity with click stops at 7 and 15 feet. Shutter speeds of B, 1/8 - 1/250. Built-in tripod socket and cable release socket. It also had a PC connection and a cold flash shoe. No meter. Filter thread of 22.5mm. On the front it says Pen W and it was only available in a black body, but a few gold examples were probably made.
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