Slr Camera Digital Lenses can be made of glass or plastics. So why does it matter whether way? They are complicated pieces of tool and light is particularly sensitive to how it is treated. Furthermore, camera lenses can be made of manifold elements that all work together to furnish the desired zoom. This all adds to the complexity and therefore amplifies limited differences in optical quality etc.
Some higher end complicated lenses may have 20 or more elements. These are most generally made of glass, generally due to its classic optical properties and also because if its relatively good resistance to scratching. Some other materials like Quartz glass, fluorite and assorted forms of plastic are also used.
Plastics are often used because they allow the organize of extremely aspherical lens elements which are almost impossible to generate using glass. Plastics in can facilitate an improved lens organize process and improve the general performance quality of the camera too. While plastic is often used on inner elements, they are only used on the outermost elements of all but the cheapest lenses as they scratch easily.
An indication of their utility is that molded plastic lenses are used in the organize of the cheapest throw-away disposable cameras. Manufacturers of quality optics tend to use substitutes such as "optical resin". While it is true that glass provides for higher quality performance than plastic, many contemporary and high performance lenses from big brand labels include some molded or hybrid aspherical elements.
So if you are deciding on which to go with, glass is pretty much an indication of higher quality relative to plastic. Its properties naturally treat light good and furnish a truer picture.
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