years, the CMOS sensor technology has spread to medium-format photography with Phase One being the first to launch a medium format digital back with a Sony-built CMOS sensor.

In 2012, Sony introduced the stacked CMOS BI sensor. There have been several research activities ongoing in the field of image sensors. One of them is the quanta image sensor (QIS), which might be a paradigm shift in the way we collect images in a camera.