If you think that the war between crop-frame and full-frame only starts in the digital age, you are simply wrong 🙂

PenF is a half frame SLR camera introduced by Olympus (this guy loves crop frame!) in 1963. The camera works on the frame of half size of the 35mm. It simply means that on PenF, a roll of 35mm film can be used to capture 72 exposures instead of 36. Later in 1996, Kodak introduced APS film (Advanced Photo System) with even smaller size (the crop factor is about 1.25x, still bigger than the digital APS-C, APS-H sensor). It comes with more advance features like recording aspect ratio, the date and time that the photograph was taken, exposure data such as shutter speed and aperture setting, more or less like EXIF in digital files.

None of these formats is still popular nowadays (if you still consider 35mm film as popular :D), mainly because of economic reasons. In fact, I wouldn’t know about APS film if not for the Canon ELPH LT I got from my Dad. It is a toy-like Point-n-Shoot (PnS) camera using APS film, very small size