- High performance E lens with excellent contrast; Minimum Aperture (F): 22.
- Minimum Focus Distance : 1.48 (Wide) 3.12 ft (Tele), Maximum Magnification ratio : 0.11x, Focal Length : 18 105 mm.
- Versatile 27 158mm (35mm equiv.) zoom range. Angle of view (APS C): 76° 15°. Number of aperture blades are 7.
- Constant F4 maximum aperture throughout the zoom range. Filter diameter (mm):72 mm.
- It is recommended that you use a lens hood to reduce flare and ensure maximum image quality.Focal Length (mm) 11/16 4 1/8 35 mm equivalent focal length (APS C) 1 1/16 6 3/16 inches.
Product Description
-------------------
True to its high-end G Lens heritage, the SELP18105G lens
features two ED glass elements and three aspherical elements for
high resolution and contrast throughout the entire zoom range.
The first Sony G Lens created specifically for E- cameras is
true to its heritage, achieving outstanding resolution and
contrast throughout the zoom range thanks to an advanced optical
design incorporating two ED glass elements and three aspherical
elements. From wide angle to medium telephoto, this power zoom
lens covers approximately a 6x zoom range with a constant F4
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. 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. 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. 2013 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. All rights reserved. Sony, the Sony logo, Alpha, (a) and
Super Steady are trademarks of Sony. All other trademarks are
trademarks of their respective owners.
From the Manufacturer
---------------------
E PZ 18-105mm F4 G OSS Power Zoom Lens
--------------------------------------
The first Sony G Lens created specifically for E- cameras is
true to its heritage, achieving outstanding resolution and
contrast throughout the zoom range thanks to an advanced optical
design incorporating two ED glass elements and three aspherical
elements. From wide angle to medium telephoto, this power zoom
lens covers approximately a 6x zoom range with a constant F4
aperture.
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.
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.
2013 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.
All rights reserved. Sony, the Sony logo, Alpha, (a) and Super
Steady are trademarks of Sony. All other trademarks are
trademarks of their respective owners.