Olympus's wide-angle half-frame Pen — 25mm f/3.5 D.Zuiko, manual zone focus, no meter, 1964.
The Olympus Pen W was a half-frame viewfinder camera made by Olympus, part of the Pen family that Yoshihisa Maitani designed to shoot two exposures in the space of one standard 35mm frame. Introduced in 1964, the W (for Wide) was a wide-angle member of the manual Pen D line and was produced in comparatively small numbers, which makes it a sought-after item among Pen collectors today.
As a half-frame camera it exposes two 18x24mm images across each 24x36mm section of 35mm film, roughly doubling the number of shots on a roll (about 72 from a 36-exposure cassette). It carries a fixed 25mm f/3.5 D.Zuiko lens, wider than the standard Pen normal lens, focused by scale/zone estimation rather than a rangefinder. Exposure is set manually on the lens with no built-in meter; the leaf shutter runs a range of speeds and the bright-line optical finder frames the vertical half-frame format. The lens does not interchange.
The wide 25mm coverage and vertical-format framing suit street and travel photography where a compact, quiet camera and a high frame count are useful. Handling is fully manual, so it rewards a photographer comfortable setting aperture, shutter and zone focus by hand, and the small body slips easily into a pocket or bag for everyday carry.
On the used market check the leaf shutter fires cleanly at all speeds and does not stick when cold, and inspect the lens for haze, fungus and separation as the small optics gather deposits with age. Verify aperture blades are dry and free of oil, that the focus and film-wind mechanisms move smoothly, and that the light seals have not perished. This model has no meter, so there is no selenium-cell concern, but confirm the finder is clear and the counter advances correctly.