Over the years, the HYCAM rotating prism camera has been accepted as the industry standard for high speed photography. The new K2A optical head represents the first major optical design change since the introduction of the K2 optics in the late 1960's. The new optical system is designed to be compatible, but not interchangeable, with the current HYCAM system.
""New Improved Optical System For HYCAM Camera"", Proc. SPIE 0497, High Speed Photography, Videography, and Photonics II, (2 November 1984); doi: 10.1117/12.944481; https://doi.org/10.1117/12.944481