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First Japanese half-frame camera Made half-frame popular $29.50 with f3.5 lens in 1960 ($213 in 2009 dollars)
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Click image to zoom
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Click image to zoom
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Olympus certainly didn't invent half-frame,
although it wasn't always called "half" frame since
it was a full 35mm movie frame.
This ad from the October 1948 issue of
Popular Photography called it single-frame:

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