German brand Zeiss was founded in 1846. The leading brand in the field of lens optics, 22 Nobel Prize winners all use Zeiss instruments for research and development.
/kloc-for more than 60 years, Zeiss's brand has represented continuous innovation, precision manufacturing and excellent quality, and almost defined the industry standard.
As the physicist Ernst Karl Abbe is the inventor of Abbe number of lens and one of the founders of Zeiss, Zeiss lens has always paid special attention to the control of Abbe number. At the same refractive index, the dispersion of Zeiss lens is much lower than that of other brands, and the wearing comfort is greatly improved.
The slight difference between the two kinds of resin lens materials leads to different refractive indexes. This means that the higher the refractive index of the same degree, the thinner the lens, and the refractive index of the resin sheet is 1.49- 1.74. Of course, the greater the refractive index, the more serious the dispersion and the lower the transmittance, so don't blindly pursue high refractive index if the degree is not high. The refractive index of the glass lens can be higher. Ultra-high myopia can be chosen, and Zeiss is good at it.
Some progressive lenses for the elderly, customized lenses with high myopia and high astigmatism, and color-changing lenses are much more expensive than ordinary films. ?
Compared with spherical lenses, aspherical lenses have smaller field deformation, so they are more expensive, but they have basically become popular.