Princeton Instruments - now combined with Acton Research, designer and manufacturer of world renown monochromators and spectrographs as well as high-performance optical coatings - is the world\'s leading designer and manufacturer of high-performance light detection systems for spectroscopy, imaging and X-ray applications. Princeton Instruments has shaped the \"state of the art\" in CCD, EMCCD, and ICCD camera technologies since the early 1980s. Princeton Instruments\' key innovations include a first-in-the-industry spectroscopy camera which included a photodiode array (and later, the first to use a CCD), as well as the first high-performance, gated, intensified CCD camera. In addition to breaking new ground in the field of spectroscopy over the years, we have designed CCD cameras with the highest sensitivity available for scientific imaging applications (~2 e- rms read noise with QE >90%). And for high speed, low-light applications, we offer our no-compromise EMCCD cameras. The Acton brand of spectroscopy products - now part of the Princeton Instruments Spectroscopy Group - continuously delivers new technological standards, including: Acton Series of multi-grating monochromators and spectrographs Acton LS Series - Lens Spectrographs TriVista Triple Spectrograph Systems Acton Optics & Coatings, now available from Princeton Instruments, has a history of innovative design and manufacturing processes which began in the early 1960s with the development of VUV coatings and optical filters used primarily in analytical and aerospace applications. In the 1970s, Acton was involved in providing laser mirrors to the first excimer laser developers. Presently, Acton optics and optical coatings are produced for cutting-edge applications including semiconductor laser systems and excimer laser vision-correction instruments (LASIK), as well as a variety of analytical instrumentation systems.