MicroFourThirds

Micro Four Thirds is a mirrorless interchangeable-lens camera system standard developed by Olympus and Panasonic. It is based on the Four Thirds system but features a significantly shorter flange focal distance, allowing for smaller and lighter camera bodies and lenses. The name "Four Thirds" refers to the image sensor's approximate diagonal measurement, which is about 4/3 inches. This sensor size is smaller than that found in DSLR cameras but larger than those in most compact digital cameras and smartphones.

The Micro Four Thirds system offers several advantages. Its smaller sensor size contributes to more compact camera bodies and lenses, making it an attractive option for photographers prioritizing portability. The shorter flange focal distance provides greater flexibility for lens design, enabling wider apertures in smaller lenses and the possibility of adapting lenses from other systems with relative ease. The system uses a bayonet mount for attaching lenses. Both Panasonic and Olympus (now OM System) produce cameras and lenses for this standard, and other manufacturers also offer compatible lenses.