Sony 16-80mm f/3.5-4.5 Carl Zeiss Vario-Sonnar T DT Zoom Lens for Sony Alpha Digital SLR Camera

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Product Overview

• Brand: Sony
• Focal Length: 16-80mm
• Type: Standard
• Focus Type: Auto & Manual
• Maximum Aperture: f/3.5-4.5
• Mount: Sony/Minolta Alpha

D1) SONY 16-80MM 3.5-4 ZEISS Lens From the Manufacturer
Vario-Sonnar T DT 16-80mm F3.5-4.5 ZA Zoom LensThe lightest and most compact
zoom in the Carl Zeiss lineup, this lens offers the greatest zoom range making
it a superb single-lens solution for many photographers. It delivers acclaimed
Carl Zeiss optical performance and handling with image quality that rivals the
best prime lenses at any focal length.TechnologyCircular ApertureWhen changing
your aperture to defocus the background, the light sources appear blurred.
This ‘bokeh’ effect of the blurred background can be enhanced with circular
aperture blades used in this lens. Conventional aperture blades have flat
sides creating unappealing polygonal shaped defocussed points of light. α
lenses overcome this problem through a unique design that keeps the aperture
almost perfectly circular from its wide-open setting to when it is closed by 2
stops. Smoother, more natural defocusing can be obtained as a
result.Aspherical lens elementsAspherical lens design dramatically reduces
spherical aberration while also reducing lens size and weight. Spherical
aberration is a slight misalignment of the light rays projected on the image
plane. This is caused by differences in refraction at different points on
conventional spherical lenses which degrade image quality in large-aperture
lenses. Specially shaped “aspherical” elements near the diaphragm restore
alignment of light rays at the image plane, maintaining high sharpness and
contrast even at maximum aperture and can also be used at other points in the
optical path to reduce distortion. Well-designed aspherical elements can
reduce the total number of elements required in the lens, thus reducing
overall size and weight. Advanced Aspherical (AA) elements are an evolved
variant, featuring an extremely high thickness ratio between the center and
periphery. AA elements are exceedingly difficult to produce, relying on the
most advanced molding technology to consistently and precisely achieve the
required shape and surface accuracy, resulting in significantly improved image
accuracy and quality.Carl Zeiss T (T-star) coatingCoated optics were
pioneered by Carl Zeiss - and this superb lens features the Carl Zeiss T
(T-Star) coating that virtually eliminates lens flare, internal reflection and
light scattering that can otherwise occur at glass-to-air surfaces. The T
coating contributes to outstanding image quality, with high contrast and
uniformly excellent resolution right out to the image edges. Not simply
applied to any lens - the T symbol only appears on multi-element lenses in
which the required performance has been achieved throughout the entire optical
path, therefore guaranteeing the highest quality.Distance encoderThe distance
encoder plays an integral part in ADI flash metering, which delivers high
precision flash metering that is unaffected by the reflectance of subjects or
backgrounds. The distance encoder is a lens component that directly detects
the position of the focusing mechanism, and sends a signal to the CPU in order
to measure distance to the subject. During flash photography, this data is
very useful in calculating how much flash output is appropriate to the
scene.Additional FeaturesInternal focusingOnly the middle groups of the
optical system move to achieve focus, so the overall length of the lens does
not change. Other important benefits include fast autofocusing and a short
minimum focusing distance. Also, the filter thread at the front of the lens
does not rotate, which is convenient if you’re using a polarizing filter.2006
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their respective owners.