Solid-state imaging device, manufacturing method thereof, and camera with alternately arranged pixel combinations

A solid-state imaging system comprising:

• a solid-state imaging device in which a plurality of pixels are integrated on a light sensing surface;
• an optical system which guides incident light to an imaging unit of the solid-state imaging device;
• and
• a signal processing circuit which processes output signals of the solid-state imaging device,
• wherein the solid-state imaging device includes:
• a semiconductor substrate;
• and
• a pixel unit having a plurality of pixels on the semiconductor substrate,
• wherein the pixel unit includes first pixel groups having two or more pixels and second pixel groups being different from the first pixel groups,
• wherein a portion of the pixels in the first pixel groups and a portion of the pixels in the second pixel groups share a floating diffusion element.