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Photo of rod lensesCredit: Wikipedia Sibatadr
February2013
Rod Lenses
In optics, a relay lens is a lens or lens group that inverts an image and extends the optical tube. Relay lenses are found in endoscopes and periscopes for the purpose of extending the system, and before eyepieces for the purpose of inverting an image. They may be made of one or more conventional lenses or achromatic doublets, or a long cylindrical gradient-index of refraction lens (a GRIN lens). Relay lenses operate by producing intermediate planes of focus.
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September2015
Eye-safe Visible Lasers
NORCO, Calif. (May 19, 2011) Daniel King, Microwave/Electro-Optic (MS32) electronics engineer at Naval Surface Warfare Center (NSWC), Corona Division, prepares alignment of various optical components using eye-safe visible lasers. Under the Navy Metrology Research and Development Program, NSWC Corona' E-O Group has developed and patented two calibration standards for support of laser designator and rangefinder test sets. The laser transmitter supports standards keeps ordnance on target and reduces the cost of maintenance for the fleet. (U.S. Navy photo by Greg Vojtko/Released) 110519-N-HW977-022
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October2015
Hubble Space Telescope (HST)
Orbiter Discovery performs a flyaround of the Hubble Space Telescope (HST) after redeployment on the second servicing mission designated HST SM-02. The silvery telescope, with its aperture door open, is sharply contrasted by the velvety blackness of space.
