1, Carl Zeiss
Carl Zeiss is a German company that manufactures optical systems, industrial measuring instruments and medical equipment, and is a world-class manufacturer of camera lenses. Carl Zeiss products are mainly: eyeglass lenses, microscopes, camera lenses, head-mounted displays, astronomical planetarium.
2, rodenstock
RODENSTOCK (Rodenstock) belongs to RODENSTOCK Rodenstock company, is a brand of eyeglasses. 1877 by Joseph Rodenstock founded in Würzburg, Germany.
The production site is located in the famous historical city of Munich, Germany, and employs nearly 4,000 people worldwide, with sales subsidiaries and distribution partners in more than 80 countries. Rodenstock operates 14 lens production sites in 12 countries.
Expanded Information1, lens classification
1, glass lenses
Glass lenses, the main raw material is optical glass, with superior optical properties, light transmission and mechanical and chemical properties of the performance of a good, constant refractive index, physical and chemical properties of the stability of the second glass lenses have a high refractive index, commonly used in the lens use of the highest refractive index of 1.9, and finally, glass lenses have a high refractive index, commonly used in the use of lenses of up to 1.9, and lastly, glass lenses have a high refractive index. 1.9, and finally, the surface hardness of glass lenses is high, more resistant to wear and tear.
2, resin lenses
Resin is a kind of hydrocarbon (hydrocarbon) secretion from plants, especially pine and cypress plants, which is valued for its special chemical structure. Resin can be categorized into two types: natural resin and synthetic resin, and resin lenses are lenses that are chemically synthesized and processed and polished using resin as the raw material.
The advantages of resin lenses are obvious, its quality is light, more comfortable to wear; secondly, resin lenses are strong in impact resistance, not easy to break and safer; at the same time, resin lenses also have a good light transmittance;
3, PC lenses
PC lenses, also known as the space piece, the chemical name is polycarbonate, has the toughness, not easy to break, and can effectively prevent the lens from shattering in the intense movement, at the same time, the quality of PC lenses is very high, so the lens will be able to prevent the lens from breaking. At the same time, PC lenses are light in quality, specific gravity is only 2 grams per cubic centimeter, and have good UV protection, but because of the high price, processing trouble and dispersion control is not ideal, PC lenses are only a small number of sales on the market.
Baidu Encyclopedia - Lenses
Baidu Encyclopedia - Carl Zeiss
Baidu Encyclopedia - Rodenstock