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Source: Olympus Pen F

The Olympus Pen F, Pen FT and Pen FV are very similar half-frame 35 mm single-lens reflex (SLR) cameras with interchangeable lenses produced by Olympus of Japan between 1963-1966 (Pen F), 1966-1972 (Pen FT) and 1967-1970 (Pen FV).
The original Pen F has a double-stroke film advance and a distinctive logo rendered in a gothic font. The later Pen FT added a single-stroke film advance, and an uncoupled, integrated light meter, which uses a system of exposure numbers rather than f-stops. The exposure numbers were added to the aperture rings of later Pen F lenses; the rings could be pulled out and rotated to show conventional f-stops instead. A side-effect of the FT's light meter was a dimmer viewfinder. The Pen FV was essentially a Pen FT with the light meter deleted and the F's brighter viewfinder reinstated.
Half frame means that the camera uses an 18×24 mm vertical (portrait) format, producing twice the pictures on a roll of 135 film as the regular 36×24 mm format. The smaller image format also allows for a smaller camera and lenses, making the Pen F system one of the smallest SLR systems ever made; the Pentax Auto 110 was smaller, but with a much more limited range of lenses and accessories, and smaller 110 film.
These cameras are somewhat exceptional since they used a rotary focal-plane shutter, rather than the two-curtain focal-plane shutter commonly used in other SLRs at that time. Since this one-piece shutter opens fully before it starts to close, it can synchronize to electronic flash at all shutter speeds.
Pen-F series cameras are occasionally modified to mount standard motion picture camera lenses for use as film test cameras with 35mm motion picture films. The Pen-F frame size is close to the 35mm motion picture Super 35 frame.

Lenses manufactured for the Olympus Pen F System

References

Source: Olympus PEN-F

The Olympus PEN-F is a mirrorless interchangeable-lens camera in the Micro Four Thirds system, released in 2016. It is the part of the digital PEN series. The PEN-F pays tribute to the similarly named PEN F half-frame 35mm film SLR camera from 1963.
The PEN-F was the first Olympus camera to feature the new, 20 megapixel Four Thirds sensor, which made Micro Four Thirds more competitive on the market. This sensor later found its way into the OM-D series as well, featured in professional cameras like the E-M1 Mark III.
The PEN-F had an electronic viewfinder, which was a new feature in the digital PEN range, and it is still the only PEN camera to have it.
It has 10 frames per second continuous shooting and its fastest shutter speed is 1/8000 sec, it has focus peaking to assist manual focus, and built in Wi-Fi for connection to smartphone or tablet. Its rear LCD is a fully articulated "swivel" rear touch screen with a 1.04 million pixel resolution. The PEN-F comes in two colour schemes: black, or silver.