The Pentax Optio S50 is a digital compact camera announced by

Pentax is a brand name used primarily by the Japanese multinational imaging and electronics company Ricoh for DSLR cameras, lenses, sport optics (including binoculars and rifle scopes), and CCTV optics. The Pentax brand is also used by Hoya Corporatio ...

on August 16, 2004. It contains an early example of a selective colour filter.

References

*http://www.dpreview.com/products/pentax/compacts/pentax_optios50/specifications {{camera-stub Pentax cameras Cameras introduced in 2004