How do I know if the lens of the camera is glass or resin?

Answer:

Resin lens and the advantages and disadvantages of glass lenses: weight Resin lenses: light, is one-half of glass lenses Glass Lens: Heavy Impact resistance Resin lens: high impact resistance, easy to break, safe Glass lens: low impact resistance, easy to break Dyeing situation Resin lenses: easy to dyed a variety of colors, with the clothing, popular to do with the appropriate. Glass lens: not stainable Anti - UV Resin lens: almost completely cut off the wavelength of 350mm below the UV Glass lenses: glass lenses cut off the UV effect as resin lenses Anti-fog Resin lenses: anti-fog strong, fast subsided steam, hot water vapor and produce fuzzy unknown phenomenon Glass lenses: anti-fog weak, easy to subside steam, hot water vapor and produce fuzzy unknown phenomenon Anti-dent Resin lenses: high heat and small volume of material is not easy in the resin sheet surface caused any traces Glass Lens: High heat and small volume material is easy to cause dent and spots in glass Surface Reflectivity Resin lens: the surface reflection is lower than the general glass, not dazzling Glass lens: the surface reflection is higher Transmittance Resin lens: no film transmittance of 92% plus film transmittance of 99.6% Glass Lens: Unmanned film Transmittance of 80% -91% Film transmittance of 98% Abrasion resistance Resin lenses: easy to scratch, is hardened by the improvement Glass lenses: high surface hardness, easy to scratch Thickness situation Resin lenses: the same degree than the glass lens to thicker Glass lenses: the same degree than the resin lens thinner Heat resistance Resin lenses: heat resistance is lower than glass lenses Glass lenses: heat resistance is higher than resin lenses

???This is because the glass thermal conductivity is much larger than the thermal conductivity of the chemical synthetic resin, while the human body's tongue is a high sensitivity temperature sensor. ????????Modern zoom lens in order to eliminate color, often use aspherical lens. The cost of grinding aspheric lenses with glass is very high. The use of resin is simple, direct injection molding can be. Therefore, the ordinary lens if you want to use aspherical lens, the general use of resin instead of glass. ????????From the optical performance, the difference between the two is very limited. But after long-term use, the degree of aging resin lenses than glass serious.

Dedicated precision instruments can be tested, but with the easiest way to do the following: ???????First at the same room temperature, the lens to be tested and the two glasses (a pair of glass lenses, a pair of tree refers to the lens of the lens) for a period of time to adapt to room temperature, with the tongue were gently touch the glass lens and tree finger Lens, find out the difference between the two. Glass lens tongue feel more cold, and the tree refers to the lens feel more warm tongue. Find the difference between the two, immediately wipe the tongue with a paper towel touch the camera lens, such as the tongue feel more cold is a glass lens, such as the tongue is more warm feeling is the tree finger lens.