Nikon, is a multinational corporation headquartered in Tokyo, Japan specializing in optics and imaging. Its products include cameras, binoculars, microscopes, measurement instruments, and the steppers used in the photolithography steps of semiconductor fabrication, of which it is the world's second largest manufacturer. The companies held by Nikon form the Nikon Group. Nikon created some of the first digital SLRs (DSLRs) as research projects for NASA in 1991.After a 1990s partnership with Kodak to produce digital SLR cameras based on existing Nikon film bodies, Nikon released the Nikon D1 SLR under its own name in 1999. Although it used an APS-C-size light sensor only 2/3 the size of a 35 mm film frame (later called a "DX sensor") the D1 was among the first digital cameras to have sufficient image quality and a low enough price for some professionals (particularly photojournalists and sports photographers) to use it as a replacement for a film SLR. The company also has a Coolpix line which grew as consumer digital photography became increasingly prevalent through the early 2000s. Nikon first started by naming the cameras with a series name (like the L35/L135-series, the RF/RD-series, the W35-series, the EF or the AW-series. In later production cycles, the cameras were double branded with a series-name on the one and a sales name on the other hand. Sales names were for example Zoom-Touch for cameras with a wide zoom range, Lite-Touch for ultra compact models, Fun-Touch for easy to use cameras and Sport-Touch for splash water resistance. nikon cameras strap