Olympus's fast automatic half-frame Pen EED — 32mm f/1.7 F.Zuiko, CdS auto-exposure, 1967.
The Olympus Pen EED was a half-frame viewfinder camera made by Olympus, introduced in 1967 as an automatic model that combined a fast lens with battery-powered metering, within the Pen family originated by Yoshihisa Maitani in 1959. It sat between the simple auto EE cameras and the manual D series, offering a brighter lens than the EE while keeping automatic exposure.
Half-frame operation means it records two 18x24mm images in each 24x36mm span of 35mm film, so a 36-exposure roll gives around 72 pictures. It has a fixed 32mm f/1.7 F.Zuiko lens focused by zone scale, and unlike the selenium EE models it uses a CdS meter that requires a battery to drive its programmed automatic exposure. The leaf shutter is electronically influenced by the meter, and the bright-line finder frames the vertical half-frame image. The lens is not interchangeable.
The fast f/1.7 lens makes the EED more capable in low light than the standard EE cameras while retaining automatic ease of use, suiting street, travel and available-light shooting. The zone focusing gives some control over closer subjects, and the high frame count and pocketable body support documentary and everyday photography.
On the used market, note the EED uses a battery-powered CdS meter rather than selenium, so check the battery compartment for corrosion and confirm the meter and auto exposure respond with a suitable cell; the original mercury-cell voltage should be borne in mind. Test the leaf shutter, inspect the lens for haze and fungus, verify the zone-focus ring, and examine the light seals and finder for age deterioration before use.