sentences:  A number of other manufacturers have produced K-mount lenses, and several other manufacturers (such as Konica and Ricoh) have made K-mount cameras.In 2005 Pentax and Samsung entered into a cooperation resulting in the Samsung GX line of DSLRs, based largely on Pentax technology including the Pentax K mount.Sigma Corporation, better known for manufacturing lenses for other cameras, has made some film SLR and DSLR cameras themselves.