Sea Tidbits: 1757, Duro by studying glass and water refraction and dispersion, established the theoretical basis achromatic lens with crown glass and flint glass achromatic lens. Since binoculars, achromatic refractor completely replaced the long lens barrel telescope. However, due to technical limitations, it is difficult casting large flint glass telescope prices in the early achromatic telescope, can only grind out 10 cm lens. Taiyuan sea breeze Electronics Co., Ltd. The company was established in 2002, specializes in wholesale sales of telescopes and spotting scopes, binoculars, outdoor equipment. Sea Tidbits: Advantages refracting telescope is focal length, large scale film on the tube bend-insensitive, best suited to do astrometry aspects of the work. But it is always residual chromatic aberration, while the ultraviolet and infrared radiation absorption band is very powerful. And great optical glass casting is also very difficult to Yerkes telescope built in 1897, reflects the culmination of the development of the telescope, the next hundred years, no bigger refractor appear. This is mainly because technically can not be perfect casting a large piece of glass lenses, and, due to the large size of the lens distortion gravity will be very obvious, and therefore lose focus Octavia. Taiyuan sea breeze Electronics Co., Ltd. The company was established in 2002, specializes in wholesale sales telescopes, binoculars, outdoor equipment. Telescope, binoculars Jinzhong, Taiyuan sea breeze provided by electronic Electronics Co., Ltd.. Taiyuan sea breeze Electronics Co., Ltd. (www.tyhfdq.com) strong, credible, in Taiyuan, Shanxi telescope industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead you hand into the sea of ??electrons and brilliant, for a better future!