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