Canon EF-S 55-250mm f/4.0-5.6 IS Telephoto Zoom Lens for Canon Digital SLR Cameras + Lens Cleaning Kit

!±8± Canon EF-S 55-250mm f/4.0-5.6 IS Telephoto Zoom Lens for Canon Digital SLR Cameras + Lens Cleaning Kit

Brand : Canon | Rate : | Price : $203.00
Post Date : Feb 05, 2012 12:17:04 | Usually ships in 1-2 business days

Product Description Kit Includes: 1) Canon - Canon EF-S 55-250mm f/4-5.6 IS Telephoto Zoom Lens. 2) Sakar - Sakar 3pc Lens Cleaning Kit 3) ButterflyPhoto - Butterfly Photo Micro Fiber Cleaning Cloth

• Focal length: 55-250mm
• Maximum aperture: f/4 to f/5.6
• Filter size: 58mm
• Optical Image Stabilizer technology
• Kit includes All Brand New Items with all Manufacturer-supplied Accessories + Full USA Warranties

Mystery Brigade Orange Skateboard Deck - 8" X 32"... For Sale

Sigma 18-250mm f/3.5-6.3 DC OS HSM IF Lens for Nikon Digital SLR Cameras

!±8± Sigma 18-250mm f/3.5-6.3 DC OS HSM IF Lens for Nikon Digital SLR Cameras

Brand : Sigma | Rate : | Price : $479.00
Post Date : Jan 10, 2012 18:00:42 | Usually ships in 24 hours

The SIGMA 18-250mm F3.5-6.3 DC OS HSM incorporates Sigma's original anti-shake compensation function, with a 13.8 times zoom ratio. For the camera have anti-shake function in the camera body, this lens's Hybrid Optical Stabilizer provide not only anti-shake function for the camera body compensation, but also provide the function to compensate the image shaking in the view finder of the camera like anti-shake compensation built in the lens. Incorporating four Special Low Dispersion glass elements and three Aspherical lens elements provides excellent image quality throughout the entire zoom range. This lens has a minimum focusing distance of 45cm (17.7 inches) at all focal lengths and a maximum magnification of 1: 3.4 reproduction ratio, making it ideal for close-up photography. An inner focusing system eliminates front lens rotation, making it suitable for use with circular polarizing filters and the supplied petal-type hood. Incorporating super multi layer coating reduce the ghost in the backlight photography.

• Equipped with Sigma's own unique OS (Optical Stabilizer) technology
• Four SLD elements and three Aspherical lenses provide high image quality throughout the entire zoom range
• Minimum focusing distance of 45cm/17.7 inches and a maximum magnification of 1:3.4 makes it ideal for close-up photography
• Super multi-layer coating reduces flare and ghosting
• For Nikon digital SLR cameras

Uniden Powermax Buy Online

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?

Order Lexmark Z55 Verilux Bulb Quickly