The Pentax Optio S50 is a digital compact camera announced by

Pentax was a Japanese camera and optical equipment manufacturer. Currently, it exists as the Pentax Life Care Business Division of Hoya's medical endoscope business, as well as the digital camera brand of Ricoh Imaging, a subsidiary of Ricoh. Penta ...

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