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     Photoelectric Instrument Co., Ltd. Nantong Chang is a professional production of Sight (riflescope) products, enterprises, for many years of production history and a wealth of production experience. Modern China City is located in beautiful garden city - Nantong, Jiangsu Province.
   The company mainly produces the gun used riflescope , Red Dot riflescope ( riflescope ), concept of the target mirror, tele-riflescope, periscope, and so on. The company has more than 100 regular employees, including management, technical personnel 20 people.
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Riflescope knowledge: sight, or riflescope, today's riflescope can be divided into three categories: Telescopic riflescope (Tele riflescope), collimating optical sight (Collimating riflescope), reflective sight (Reflex riflescope) . Among them, Telescopic sight and reflective riflescope of the most popular. Sight (riflescope) options: one, general type of conventional air gun or bow range is limited, with six times the sight can be. Than 12 times the best on the bracket. 2, hunting mainly targeting with the zoom lens (riflesope), all year round on the fire a gun at the shooting range, then the unnecessary use of zoom. With regard to hunting users, hunting with a more independent view of the target mirror telescope, or better, This is also not frequent conversion of thermal weapon sight magnification to improve the life of thermal weapon sight. Third, the method of calculation formula of riflescope. the human eye pupil diameter X optical sights multiplier = lens diameter. 4, aiming mirror lens focusing function, mainly at adjusting parallax. Optical engineers thermal weapon sight, carry on the consumer parallax design.
  
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