SLR Camera Digital Lenses - Glass Or Plastic?

!±8± SLR Camera Digital Lenses - Glass Or Plastic?

SLR Camera Digital Lenses can be made of glass or plastics.  So why does it matter either way?  They are complex pieces of equipment and light is particularly sensitive to how it is treated.  Furthermore, camera lenses can be made of multiple elements that all work together to provide the desired zoom.  This all adds to the complexity  and therefore amplifies slight differences in optical quality etc. 

Some higher end complex lenses may have 20 or more elements.  These are most commonly made of glass, mainly due to its superior optical properties and also because if its relatively good resistance to scratching. Some other materials like Quartz glass, fluorite and various forms of plastic are also used.

Plastics are often used because they allow the manufacture of highly aspherical lens elements which are almost impossible to create using glass. Plastics in   can facilitate an improved lens manufacture 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 manufacture 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 modern 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 simply treat light better and provide a truer picture.

SLR Camera Digital Lenses - Glass Or Plastic?

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Sigma 18-50mm f/2.8-4.5 SLD Aspherical DC Optical Stabilized (OS) Lens with Hyper Sonic Motor (HSM) for Sigma Digital SLR Cameras

!±8±Sigma 18-50mm f/2.8-4.5 SLD Aspherical DC Optical Stabilized (OS) Lens with Hyper Sonic Motor (HSM) for Sigma Digital SLR Cameras

Brand : Sigma
Rate :
Price : $199.00
Post Date : Dec 21, 2011 17:45:09
Usually ships in 1-2 business days

An upgrade to its predecessor, the 18-50mm F2.8-4.5 DC OS HSM is a lens dedicated to digital SLR cameras with APS-C size image sensors offering a large aperture and Sigma’s Optical Stabilization. Once again, Sigma has also engineered the built-in OS function, an anti-shake system, for Sony and Pentax mount allowing the photographer to see a stabilized image in the viewfinder. The combination of the large aperture of F2.8 and anti-shake function makes capturing exceptional photos in low light achievable, and the wide angle is well suited for indoor photography. Two SLD (Special Low Dispersion) glass elements and three Aspherical lenses provide excellent correction for all types of aberrations. The Super Multi-Layer Coating reduces flare and ghosting. Designed with inner focusing and inner zooming systems, high image quality is assured throughout the entire zoom range. The overall length of the lens does not change during focusing and zooming ensuring convenient handling. This lens has a minimum focusing distance of 11.8 inches (30cm) throughout the entire zoom range and a maximum magnification ratio of 1:4.1. The incorporation of HSM (Hyper Sonic Motor) ensures a quiet and high speed auto focus.

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