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2. Angular resolution - Wikipedia

   en.wikipedia.org/wiki/Angular_resolution

   In that case, the angular resolution of an optical system can be estimated (from the diameter of the aperture and the wavelength of the light) by the Rayleigh criterion defined by Lord Rayleigh: two point sources are regarded as just resolved when the principal diffraction maximum (center) of the Airy disk of one image coincides with the first ...

3. ELCAN Optical Technologies - Wikipedia

   en.wikipedia.org/wiki/ELCAN_Optical_Technologies

   ELCAN currently manufactures the "Specter" line of combat optics in a variety of configurations. The Specter 4× Optical Sight, DR 1.5×/6×, DR 1x/4× and TR 1/3/9 are available with a BDC reticle for the 5.56×45mm NATO or the 7.62×51mm NATO .

4. PSO-1 - Wikipedia

   en.wikipedia.org/wiki/PSO-1

   The scope body is sealed and filled with nitrogen, which prevents fogging of optics and was designed to function within a -50 °C to 50 °C temperature range. For zeroing the telescopic sight the reticle can be adjusted by manipulating the elevation and windage turrets in 5 centimetres (2.0 in) at 100 metres (109 yd) (0.5 mil or 1.72 MOA ...

5. C79 optical sight - Wikipedia

   en.wikipedia.org/wiki/C79_optical_sight

   A C79 Optical Sight. The C79 optical sight (SpecterOS3.4x) is a telescopic sight manufactured by Elcan.A variant, the M145 Machine Gun Optic is in use by the US military. It is 3.4×28, meaning 3.4x magnification, and a 28mm diameter objective lens.

6. HD Supply - Wikipedia

   en.wikipedia.org/wiki/HD_Supply

   On June 27, 2013, HD Supply Holdings, Inc., the indirect parent of HD Supply, Inc., announced that it had priced an initial public offering of 53,191,489 shares of common stock at $18.00 per share. The shares began trading on the NASDAQ Global Select Market on June 27, 2013, under the ticker symbol HDS. [6]

7. Rodenstock GmbH - Wikipedia

   en.wikipedia.org/wiki/Rodenstock_GmbH

   The Rodenstock Präzisionsoptik precision optics division, which includes the production of lenses for analog view cameras, enlargers, and digital view cameras with high-resolution digital camera backs (e.g. the 1997 Apo-Sironar digital) was spun off in 1996 as Rodenstock Photo Optics, a new company and in 2000, it was acquired by Göttingen ...