Product Description
-------------------
Super wide-angle zoom lenses are ideal for taking photos of
sweeping landscapes and producing striking images with emphasized
perspective. For mid- to high-level users who seek a wider
minimum focal length than offered by standard wideangle zoom
lenses, the SEL-1018 is the ideal choice. NOTE:"35 mm equivalent
focal length (APS-C)" and "Angle of View (APS-C)" are with
interchangeable lens digital camera incorporating APS-C type
image sensors. This super wide-angle zoom lens is perfect for
taking photos of sweeping landscapes and producing striking
images with emphasized perspective. Features incluse a constant
maximum aperture of F4 and built-in Optical Steady (OSS)
image stabilization. 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. 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 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. 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.
Gyro sensors built into the lens detect even the slightest
movement, and the stabilization lens is precisely shifted to
counteract any image blur that might occur. The use of precision,
quiet linear motors and technology inherited from high-end Sony
professional camcorders results in exceptionally quiet, effective
image stabilization that contributes to high-quality movies as
well as stills. 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. 2012 Sony Electronics All rights
reserved. Reproduction in whole or in part without written
permission is prohibited. Sony is not responsible for
typographical and photographic errors. Features and
specifications are subject to change without notice. Sony, BIONZ,
BRAVIA, Exmor, InfoLITHIUM, Memory Stick, Memory Stick Duo,
Memory Stick PRO Duo, Memory Stick PRO-HG Duo, PlayMemories Home,
Smile Shutter, Stamina, Theatre Sync, Sweep Panorama, and the
Sony make.believe logo are trademarks of Sony. AVCHD is a
trademark of Panasonic Corporation and Sony Corporation.
Microsoft, Windows, and Windows Vista are trademarks of Microsoft
Corporation. Mac OS and iMovie are trademarks of Apple Computers,
HDMI is a trademark of HDMI Licensing . All other trademarks are
trademarks of their respective owners.
From the Manufacturer
---------------------
10-18mm f/4 Wide-Angle Zoom Lens
--------------------------------
This super wide-angle zoom lens is perfect for taking photos of
sweeping landscapes and producing striking images with emphasized
perspective. Features incluse a constant maximum aperture of F4
and built-in Optical Steady (OSS) image stabilization.
Technology
----------
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.
Lens-based optical image stabilization
--------------------------------------
Gyro sensors built into the lens detect even the slightest
movement, and the stabilization lens is precisely shifted to
counteract any image blur that might occur. The use of precision,
quiet linear motors and technology inherited from high-end Sony
professional camcorders results in exceptionally quiet, effective
image stabilization that contributes to high-quality movies as
well as stills.
Additional Features
-------------------
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.
2012 Sony Electronics Inc. All rights reserved. Reproduction in
whole or in part without written permission is prohibited. Sony
is not responsible for typographical and photographic errors.
Features and specifications are subject to change without notice.
Sony, BIONZ, BRAVIA, Exmor, InfoLITHIUM, Memory Stick, Memory
Stick Duo, Memory Stick PRO Duo, Memory Stick PRO-HG Duo,
PlayMemories Home, Smile Shutter, Stamina, Theatre Sync, Sweep
Panorama, and the Sony make.believe logo are trademarks of Sony.
AVCHD is a trademark of Panasonic Corporation and Sony
Corporation. Microsoft, Windows, and Windows Vista are trademarks
of Microsoft Corporation. Mac OS and iMovie are trademarks of
Apple Computers, Inc. HDMI is a trademark of HDMI Licensing LLC.
All other trademarks are trademarks of their respective owners.
- Angle of View (APS-C) - 109 ° – 76 °.
- Minimum focal length of 10 mm (15 mm in 35 mm-camera equivalency).
- Minimum Focus Distance : 0.82 ft (0.25 m), Maximum Magnification ratio : 0.1x.
- Superbly detailed images;Aperture Maximum: f/4 ; Minimum: f/22. 35mm equivalent focal-length (APS-C) : 15-27mm.
- In-the-box:Hood (ALC-SH123), Lens front cap, Lens rear cap.