Striking Contrast and Impressive Sharpness
Tamron SP AF 17-50mm f/2.8 XR Di II VC LD Aspherical [IF]
The new Tamron SP AF 17-50mm VC encompasses the high volume 17-50mm focal range (35mm
view equivalent viewing angle of 26-78mm when translated to the 35mm SLR format) giving it an enormously usable, high performance
zoom range. Accomplishing striking contrast and sharpness, the lens delivers gorgeous images which are additionally augmented by a shallow
field depth afforded by the big maximum
f/2.8 aperture and enhance the photographers array of photographic articulation. This fast new zoom lens features the exclusive Tamron VC (Vibration
Compensation) image stabilization device, which allows more opportunities to handheld your photography, like poor
lighting situations such as night scenes evening, and indoor shooting, leading to
spectacularly enhanced height of photographic liberty.
A fast f/2.8 lens that's
wide-through-moderate-telephoto zoom and engineered exclusively for Nikon and Canon DSLR cameras with smaller image sensors. The new lens provides striking contrast and impressive sharpness and over its entire aperture range and focal-length with its maximum f/2.8 aperture size, it creates beautiful photos enhanced by shallow field depth with resulting natural, smooth, transitions to
regions of the picture.
Nov 19, 2011
• 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.
• 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
• Low Dispersion lens elements
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.
• VC - Vibration Compensation.
proprietary tri-axial Vibration Compensation (VC) mechanism that minimizes
the effects of handheld camera shake. Tamron’s image stabilization mechanism, controls the effects of camera shake in three planes. VC provides more opportunities for sharp hand-held photography (up to 4-stops) at the slow shutter speeds needed when shooting in low-light conditions (e.g. night or indoor scenes) dramatically enhancing the user’s level of photographic freedom.
• Flower Shaped Lens Hood
• Lens Caps