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SONY ALPHA DT 18-250 F3.5-6.3 ZOOM LENS

Webcode: 568SON006

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Original: $799.99

Sale Price: $749.99 Save:$50.00!

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Product Highlights :
  • High Magnification Zoom Lens
  • Compact, Lightweight Design
  • Internal Focusing System
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SONY ALPHA DT 18-250 F3.5-6.3 ZOOM LENS Original:$799.99! Save:$50.00!

Sale Price: $749.99

Special order - This item is not stocked in any of our stores.

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SONY ALPHA DT 18-250 F3.5-6.3 ZOOM LENS


 
  • High Magnification Zoom Lens
  • Compact, Lightweight Design
  • Internal Focusing System
  • Filter Diameter - 62mm
  • ED (Extra-low Dispersion) Glass
  • 14X Zooming Range
  • 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
  • Alpha 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 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
  • 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
  • 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


Lens Performance
Lens Type:Digital SLR Lenses
Focal Length:18-250mm
Maximum Aperture:f/3.5-6.3
Aperture (Max. & Min.):Max: f/3.5-6.3, Min: f/22-40
Camera Mount Type:Sony A
Format Compatibility:DSLR (APS-C Sensor)
Angle of View:76-6 degrees
Minimum Focus Distance:0.45m
Maximum Close-Up Magnification:0.29x
Groups/Elements:13 Groups/16 Elements
Diaphragm Blades:7
Lens Features
Image Stabilization:No
Autofocus:Yes
Tripod Collar:No
Physical
Filter Thread:62mm
Dimensions (DxL):3.0x3.4"
Weight:440g
Additional Information
Warranty:2 year manufacturer warranty (if purchased in Canada)

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