- Diaphragm Blades 9, Rounded. Lens Groups / Elements is 5/7.
- Focal Length: 55mm, Filter Diameter: 49mm.
- Minimum Focus Distance: 19-11/16 inches (.50m).
- Lens Type: Fixed, E- Full Frame, Lens not zoomable.
- Aperture (Min/Max): 22/1.8; Angle of View (35 mm): 43 °.
- Magnification: 14x; Battery Life (Still Images) Approx. 530 s (Viewfinder) / approx. 650 s (LCD monitor) (CIPA standard).
Product Description
-------------------
Sony Camera Lenses SEL55F18Z An all-day battery that
intelligently powers every scroll, click, call, tap, playlist and
season finale you can throw at it. Renowned Carl Zeiss contrast
and resolution brings out the best in α7 series full frame
E- bodies. The T* coating works with an innovative optical
design to suppress internal reflections, for sublime contrast
from highlights to deep blacks. In keeping with the Sonnar
concept, a large F1.8 maximum aperture can produce beautiful
full-frame background bokeh, but you also have the option of
stopping down for extended depth-of-field. A bright lens like
this is also an advantage when shooting indoors or outdoors in
low light. Linear motor driven internal focusing is smooth and
quiet, and a dust and moisture resistant design ensures
consistently reliable performance. 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.
Coated optics were pioneered by Carl Zeiss - and this superb lens
features the Carl Zeiss T* (T-Star) coating that virtually
eliminates lens flare, internal reflection and light scattering
that can otherwise occur at glass-to-air surfaces. The T* coating
contributes to outstanding image quality, with high contrast and
uniformly excellent resolution right out to the image edges. Not
simply applied to any lens - the T* symbol only appears on
multi-element lenses in which the required performance has been
achieved throughout the entire optical path, therefore
guaranteeing the highest quality. 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. 2014 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) logo, and Steady are
trademarks of Sony. Carl ZEISS and ZEISS is a trademark of Carl
Zeiss and Sony Corporation. All other trademarks are trademarks
of their respective owners.
From the Manufacturer
---------------------
Sonnar T* FE 55mm F1.8 ZA Full-frame E- Prime Lens
-------------------------------------------------------
Renowned Carl Zeiss contrast and resolution brings out the best
in α7 series full frame E- bodies. The T* coating works with
an innovative optical design to suppress internal reflections,
for sublime contrast from highlights to deep blacks. In keeping
with the Sonnar concept, a large F1.8 maximum aperture can
produce beautiful full-frame background bokeh, but you also have
the option of stopping down for extended depth-of-field. A bright
lens like this is also an advantage when shooting indoors or
outdoors in low light. Linear motor driven internal focusing is
smooth and quiet, and a dust and moisture resistant design
ensures consistently reliable performance.
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.
Carl Zeiss T* (T-star) coating
------------------------------
Coated optics were pioneered by Carl Zeiss - and this superb lens
features the Carl Zeiss T* (T-Star) coating that virtually
eliminates lens flare, internal reflection and light scattering
that can otherwise occur at glass-to-air surfaces. The T* coating
contributes to outstanding image quality, with high contrast and
uniformly excellent resolution right out to the image edges. Not
simply applied to any lens - the T* symbol only appears on
multi-element lenses in which the required performance has been
achieved throughout the entire optical path, therefore
guaranteeing the highest quality.
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.
2014 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) logo, and
Steady are trademarks of Sony. Carl ZEISS and ZEISS is a
trademark of Carl Zeiss and Sony Corporation. All other
trademarks are trademarks of their respective owners.