- Superior Image Quality.
- Minimum Focus Distance : 0.66 feet (0.2 m), Maximum Magnification ratio : 0.12x.
- Focal Length- 20 mm, Compact Length; Lens not Zoomable.
- Superb value and performance. Angle of View (APS-C) -70°. Maximum aperture (F) - 2.8. 35 mm equivalent focal length (APS-C) - 11.82 inch.
- Broaden your view with a wide angle: From a vast cliff to a stretching sandy beach, fit everything in with a 20 mm wide angle. Angle of View (APS-C): 70°.
Product Description
-------------------
20mm F2.8 Prime Lens Not only will the 20mm (30mm in 35mm
full-frame format) focal length and F2.8 maximum aperture appeal
to experienced photographers, but the outstanding resolution of
this lens will satisfy their most stringent image quality
requirements as well. Three aspheric elements help to achieve
superb contrast and resolution right out to the image edges,
while simultaneously enabling a compact 20.4 mm-thick pancake
design that makes for a portable combination with compact E-
cameras. 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. 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. Only the rear groups of the
optical system move to focus the lens, which allows for speedy AF
operation and a shorter minimum focusing distance. Since the
front of the lens does not rotate, operability is improved when
shooting with a polarizing filter attached. 2013 Sony Electronics
All rights reserved. Reproduction in whole or in part without
written permission is prohibited. Sony is not responsible for
typographic and photographic errors. Features and specifications
are subject to change without notice. Sony, BIONZ, BRAVIA, BRAVIA
Sync, Cyber-, Exmor, InfoLITHIUM, Memory Stick PRO Duo,
Memory Stick Duo, the Memory Stick logo, Optical Steady,
Remote Commander, Smile Shutter, Stamina, Steady, Theatre
Sync, TruBlack, and Xtra Fine LCD are trademarks of Sony.
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
---------------------
E 20mm F2.8 Wide-Angle Prime Lens
---------------------------------
Not only will the 20mm (30mm in 35mm full-frame format) focal
length and F2.8 maximum aperture appeal to experienced
photographers, but the outstanding resolution of this lens will
satisfy their most stringent image quality requirements as well.
Three aspheric elements help to achieve superb contrast and
resolution right out to the image edges, while simultaneously
enabling a compact 20.4 mm-thick pancake design that makes for a
portable combination with compact E- cameras.
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.
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.
Additional Features
-------------------
Rear focusing elements
----------------------
Only the rear groups of the optical system move to focus the
lens, which allows for speedy AF operation and a shorter minimum
focusing distance. Since the front of the lens does not rotate,
operability is improved when shooting with a polarizing filter
attached.
2013 Sony Electronics Inc. All rights reserved. Reproduction in
whole or in part without written permission is prohibited. Sony
is not responsible for typographic and photographic errors.
Features and specifications are subject to change without notice.
Sony, BIONZ, BRAVIA, BRAVIA Sync, Cyber-, Exmor, InfoLITHIUM,
Memory Stick PRO Duo, Memory Stick Duo, the Memory Stick logo,
Optical Steady, Remote Commander, Smile Shutter, Stamina,
Steady, Theatre Sync, TruBlack, and Xtra Fine LCD are
trademarks of Sony. 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.