Tamron AF 18-200mm F/3.5-6.3 XR Di II LD IF Lens

Description: Tamron AF18-200mm F/3.5-6.3 XR Di-II LD Aspherical (IF) MACRO

A high powered zoom lens created exclusively for use on DSLR cameras featuring an APS-C image sensor Several years subsequent to its announcement, the present AF 28-300mm zoom is even now a highly valued favorite by photographers from around the globe as a symbolic model of high powered zooms.

If you need a low light lens, this isn't it. If your primary objective is to take pictures in low light situation such as weddings and concerts, in the 18-200mm range you need 2 lenses, get the 18-50mm f/2.8 Sigma or Tamron 17-50 VC and a 70-200mm f/2.8 lens instead.

With the market flood of DSLR cameras in recent times, using high powered zoom lenses has increasingly become popular as these high powered zoom lenses impart the handling conveniences for a number of photographic situations and the ability to shoot ultra telephoto images without ever changing a lens. The widespread popularity of this particular focal length induced Tamron to develop two new zooms to further fulfill the needs of DSLR photographers.

The upshot is a successful creation of a fresh zoom lens made to be used on DSLR cameras only. The wide-angle through ultra tele focal length of this particular lens will give DSLR camera owners the pleasure of digital photography with convenience and reassurance

Digitally Integrated Design (Di), is a title Tamron includes on their lenses with optical systems engineered to compliment performance characteristics of DSLR cameras. DI Lenses include the following advantages: Reduced peripheral light fall-off, Improved Resolution, chromatic aberration reduction, ghosting and flare compensation

By using an optical layout for only use on an APS-C DSLR camera, this high powered zoom lens delivers focal length similar to the Tamron 28-300mm ( a 35mm equivalent format). Therefore, one can meet almost every photographic challenge using this single zoom without a need to change lenses. When teamed up with the Tamron AF 11-18mm zoom, announced by Tamron during the same time, you can now thoroughly enjoy DSLR photography with a combination focal length range of 17-300mm.

The Optical System employs Special Glass which is Optimized for DSLR compatibility as a way to further Enhance Optical Quality using a compact layout. This new 18-200mm high powered zoom employs a fresh new optical layout using Extra Refractive Index (XR) glass using an innovative effort to optimize the complete optical power distribution all the way through total zoom range. This layout diminishes many aberrations to an absolute minimum and realizes remarkable downsizing while doing it. In addition, two Low Dispersion LD) glass elements and three aspherical hybrid lens elements are employed to achieve effective compensation of lateral and on-axis and chromatic aberration, a crucial factor in enhancing optical quality.

Using the zoom past 135mm you'll require a tripod unless you have excellent light to steer clear of blurring from camera movement.

Nov 20, 2011

Superzoom
The term hyperzoom or superzoom is used to promote photographic zoom lenses with unconventionally large focal length factors, typically more than 4× and ranging up to 15×, e.g., 35 mm to 350 mm. The largest ratio for digital SLR cameras is held by the Tamron 18–270 mm, giving 15×. Some Digital Camera Review by Gene Wrights have even larger zoom ratios up to 35×. For movie and television use, Panavision holds the record with their 300X HD Lens.

While superzoom lenses have improved greatly in recent years, they still have a number of drawbacks in comparison with shorter-range zooms and prime lenses. Most notable is the much increased likelihood of significant distortions of the image at both extreme ends of the range. Other potential problems include smaller maximum aperture and poorer autofocus performance

Following is a list of superzoom lenses, used for 135 format in SLRs or for APS format in DSLRs. The minimal factor used here is 5× or more. A 28–200 mm has a 75° to 12.3° angle of view, a 28–300 mm (or an 18–200 mm for an APS DSLR) has an 11.1x 75° to 8.2°

• Aspherical Lens
A lens whose curved surface does not conform to the shape of a sphere. An aspheric element is often called an aspherical lens. The asphere's more complex surface profile can eliminate spherical aberration and reduce other optical aberrations compared to a simple lens. A single aspheric lens can often replace a much more complex multi-lens system. The resulting device is smaller and lighter, and possibly cheaper than the multi-lens design. Aspheric elements are used in the design of multi-element wide-angle and fast normal lenses to reduce aberrations.

• Tamron macro lens series
The Tamron macro lens series produce sharp images against soft out-of-focus backgrounds. Not limited to macro photography, these lenses cover the range from landscapes to portraiture. The Tamron macro lens series, with its wide-ranging adaptability, has achieved recognition among photography lovers around the world.

• Di-II Series Design
Design has been improved by adding a gold-colored band between the focus and zoom rings to enhance the appearance and make it stand out as a Di-II lens. The rubber patterns of the zoom and focus control rings have been improved at the same time to compliment the digital camera design style and to provide better handling. Di-II Lenses are designed for digital SLR cameras with smaller imagers  

• Low Dispersion lens elements
(LD Glass to reduce chromatic aberration for sharper images) Aspherical - contains aspherical elements (compensates for spherical aberration and distortion, making for better performance with fewer elements (and As a result allowing for smaller, lighter lenses)

• XR Technology. Extra Refractive Index Glass (reduces lens size). The first most important reason that the lens is so compact is the use of high refractive index glass. That is, XR glass. High refractive index glass bends light more than normal or lower refractive index glasses. Normally, glass material having a refractive index of more than 1.69 is called high refractive index glass. In the A03 optical system, glass material having a refractive index of more than 1.69 is used in the front group. In addition, refractive index of the whole optical system is enhanced. By using high refractive index glass in the front group, we could make the elements in the first group thinner, and reduce one element in the second group. This made the overall length of the whole optical system shorter.

• Internal Focusing
Internal focusing lens (also known as IF) is a photographic lens design in which focus is shifted by moving the inner lens group or groups only, without any rotation or shifting of the front lens element. This makes it easy to use, for example, a screwed-in polarizing filter or a petal shaped lens hood. During macro photography, using an internal focus lens reduces the risk of the front of the lens accidentally hitting the subject during focusing as the front element does not move.

• External Design Conveys High Performance, High Precision Image.7.4

• Flower-shaped Lens Hood

• High Power, Yet Compact and Lightweight Thanks to New Mechanical Artifices

• Revolutionary MFD 0.45m over the Entire Zoom Range for 1:3.7 Macro Capability

• Internal Surface Coating to Reduce Ghosting and Flare

• Dedicated for Digital SLR Cameras

• Optical System Uses Special Glass and is Optimized for Digital SLR Characteristics in order to Enhance Optical Quality in a Compact Design

• Enhanced Peripheral Illumination

• Outstanding Resolution

• Zoom Lock Mechanism Incorporated

6 Year USA Warranty, Flower Shaped Hood

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