Pentax Competitor is a term used to refer to two of the most popular camera brands in the world, Leica and Nikon. Leica is a German company that has been producing cameras since 1913, while Nikon is a Japanese company that has been producing cameras since 1948. Both companies have a long history of producing high-quality cameras and lenses, and they are often seen as the main competitors to Pentax in the camera market.