Sony 11-18mm f/4.5-5.6 DT Wide Angle Zoom Lens, a (alpha) Mount
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Sony 11-18mm f/4.5-5.6 DT Wide Angle Zoom Lens, a (alpha) Mount

Price: $798.00

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Description

About Sony 11-18mm

Product Information provided by the Manufacturer

DT 11-18mm F4.5-5.6 Wide Zoom Lens

This wide zoom lens offers a range of focal lengths that are indispensable for serious indoor and architectural photography as well as any other situation that demands wide-angle coverage. City scenes, crowded markets, historical ruins . . . all of these are subjects that can benefit from the wide perspectives this lens provides.

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Circular Aperture

When 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.

ED (Extra-low Dispersion) glass

As focal lengths get longer, lenses built with conventional optical glass have difficulties with chromatic aberration, and as a result images suffer from lower contrast, lower color quality, and lower resolution. ED glass dramatically reduces chromatic aberration at telephoto ranges, and provides superior contrast across the entire image, even at large aperture settings. Super ED glass provides enhanced compensation for chromatic aberration.

Aspherical lens elements

Aspherical 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.

Distance encoder

The 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.

Internal focusing

Only 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.

Sony Store customer reviews

Overall:

 
 

(24 reviews)


Pack more into every frame - DT 11-18mm F4.5-5.6 Wide Zoom (SAL1118) 
 The SAL1118 fits squarely into the wide zoom category, offering focal lengths that are indispensable for landscape, indoor and architectural photography. 

• High contrast throughout the zoom range 
• Circular aperture for beautiful defocus effects 
• Aspherical lens elements and ED glass ensure clarity 
• Internal focusing for fast, agile autofocus operation 
• 35mm equivalent focal length: 16.5-27mm 

Capture fast action interior scenes with the capability to focus quickly and zoom from super-wide-angle to wide-angle with the Sony SAL-1118 zoom lens. With the capability to focus quickly and zoom from super-wide-angle to wide-angle, this lens captures interior scenes with greater flexibility and handles fast action in close environments. 

Its DT design is ideally suited for the APS-size CCD imager of the Sony a (alpha) DSLR-A100 camera, and its 35mm-equivalent zoom range of 16.5mm to 27mm gives you wide latitude in framing and composition. Lens elements at the rear of the optical system move, allowing rapid auto-focus response. Aspherical elements correct frame distortion to provide more visually accurate super-wide-angle shots. 

ED Glass lenses minimize flare and greatly reduce chromatic aberration, giving you photos with sharper focus and more accurate color separation. In low-light shots or nightscapes, out-of-focus light sources have a pleasing circular defocused effect.

One reason why the Sony 11-18mm is popular is because of its Fast / accurate auto-focus

Sony 11-18mm Features

  • Aspherical Lens Elements for wide-angle accuracy
  • ED (Extra-low Dispersion) Glass for sharp, accurate colors
  • Smooth defocusing: Instead of a standard polygon-shaped lens aperture, this lens features a 7-blade circular aperture for more natural, rounded defocusing, or bokeh.
  • DT Lens Design for optimum DSLR performance
  • Excellent wide-angle to long telephoto shots
  • Fast Internal Focusing, lens length does not change

Specification

Sony 11-18mm Specifications

Construction
12 Groups/15 Elements
Includes one AD (anomalous dispersion) glass elements and three Aspheric elements.
Angle of view
104° - 76°
F stop range
Maximum: f/4.5(11mm)-5.6(18mm)
Minimum: f/22(11mm)-29(18mm)
Blades: 7-blade circular
Closest Focusing Distance
9.6" / 0.25m
Maximum Magnification
1:8
Filter Size
77mm
Dimensions (Length x Diameter)
3.2" x 3.3" / 80.5mm x 83mm
Weight
12.7 oz. /360 g
Notes
Lens hood: Petal-type hood with bayonet mount
Focus: AF motor: Camera body (coupler

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