Sony SEL55F18Z - lens - 55 mm
E Mount : Sonnar T* FE 55mm F1.8 ZA
Aspherical lens elementsAspherical 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) coatingCoated 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.
Circular ApertureWhen 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.
Internal focusingOnly 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.
Sony customer reviews
One of the sharpest lens made
|Lens Type||Sony E-mount (Full Frame)|
|Lens Mount Type||Sony E-mount (Full Frame)|
|Aperture (Max.)||f/1.8 (constant)|
|Focal Length (35mm equivalent)||
|Filter Diameter||49 mm|
|Lens Groups-Elements||5 groups, 7 elements|
|Minimum Focus Distance||
|Angle of View||
|Aperture Blade||9 blades (Circular aperture)|
|Aspheric Elements||3 aspheric|
|Lens Weight||10 oz. (281 g)|
|Weights and Measurements|
2-5/8" x 2-7/8"
(64.4 x 70.5 mm)
|Weight (Approx.)||10 oz. (281g)|
- Front and rear lens cap
- ALC-SH131 bayonet type lens hood (petal)
- Lens Case
© 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 SteadyShot 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.
Renowned Carl Zeiss contrast and resolution brings out the best in α7 series full frame E-mount 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.
Ratings & Reviews
Add the products you would like to compare, and quickly determine which is best for your needs.