The Sony FE 28-70mm F3.5-5.6 OSS is a full-frame (FE) variable maximum aperture standard
zoom lens
A zoom lens is a mechanical assembly of lens elements for which the focal length (and thus angle of view) can be varied, as opposed to a fixed-focal-length (FFL) lens (see prime lens).
A true zoom lens, also called a parfocal lens, is one ...
for
Sony E-mount
The E-mount is a lens mount designed by Sony for their NEX ("New E-mount eXperience") and ILCE series of camcorders and mirrorless cameras. The E-mount supplements Sony's α mount, allowing the company to develop more compact imaging devices whi ...
, announced by
Sony
, commonly stylized as SONY, is a Japanese multinational conglomerate corporation headquartered in Minato, Tokyo, Japan. As a major technology company, it operates as one of the world's largest manufacturers of consumer and professional ...
on October 16, 2013.
It was the first
kit lens A kit lens is a "starter" lens which can be sold with an interchangeable-lens camera such as a single-lens reflex camera. It is generally an inexpensive lens priced at the lowest end of the manufacturer's range so as to not add much to a camera ki ...
for Sony's full-frame
E-mount (FE) system,
and was released on the same day as the
Sony α7
The Sony α7, α7R, α7S and α7C (the α is sometimes spelled out as Alpha) are four closely related families of full-frame mirrorless interchangeable-lens cameras. The first two were announced in October 2013,[Sony α7R
, commonly stylized as SONY, is a Japanese multinational conglomerate corporation headquartered in Minato, Tokyo, Japan. As a major technology company, it operates as one of the world's largest manufacturers of consumer and professional ...]
. It is often bundled with various Sony E-mount
full-frame mirrorless cameras, and is a less costly alternative to other standard zooms such as the
Sony Carl Zeiss Vario-Tessar T* FE 24-70mm F4 ZA OSS
The Sony Zeiss Vario-Tessar T* FE 24-70mm F4 ZA OSS is a constant maximum aperture full-frame (FE) zoom lens for the Sony E-mount, announced by Sony on October 16, 2013.
Though designed for Sony's Full-frame digital SLR, full frame E-mount cameras ...
.
Though designed for Sony's full frame E-mount cameras, the lens can be used on Sony's
APS-C
Advanced Photo System type-C (APS-C) is an image sensor format approximately equivalent in size to the Advanced Photo System film negative in its C ("Classic") format, of 25.1×16.7 mm, an aspect ratio of 3:2 and Ø 31.15 mm field d ...
E-mount camera bodies, with an equivalent full-frame field-of-view of 42-105mm.
Construction
The lens has a
weather resistant plastic construction with a matte-black finish and rubber zoom and focus rings. The barrel of the lens moves outward from the main lens body as it's zoomed in from 28mm to 70mm.
Optical properties
The Sony FE 28-70mm F3.5-5.6 OSS shows acceptable
chromatic aberration
In optics, chromatic aberration (CA), also called chromatic distortion and spherochromatism, is a failure of a lens to focus all colors to the same point. It is caused by dispersion: the refractive index of the lens elements varies with the wave ...
and good
bokeh
In photography, bokeh ( or ; ) is the aesthetic quality of the blur produced in out-of-focus parts of an image. Bokeh has also been defined as "the way the lens renders out-of-focus points of light". Differences in lens aberrations and ...
. Corner sharpness becomes “acceptable” when the lens is stopped down to f/8.
Natively, it suffers from fairly noticeable
distortion
In signal processing, distortion is the alteration of the original shape (or other characteristic) of a signal. In communications and electronics it means the alteration of the waveform of an information-bearing signal, such as an audio signal ...
- 2.5% barrel distortion at 28mm, 3.2% pincushion at 50mm and 3.7% pincushion at 70mm, and requires correction in-camera or in raw processing.
Its optical performance is competitive with the Sony Carl Zeiss Vario-Tessar T* FE 24-70mm F4 ZA OSS in every metric tested by DxOMark.
Autofocus
The lens focuses internally, using a linear autofocus motor.
Its autofocus is “silent and accurate” and “very quick”.
See also
*
List of Sony E-mount lenses
Sony released the following ''SEL'' (for: ''S''ony ''E''-mount ''L''ens) lenses for Sony E-mount cameras since 2010. They are also compatible with Hasselblad E-mount cameras. Some of the lenses introduced into the line have been developed in coope ...
*
List of standard zoom lenses
References
Camera lenses introduced in 2013
28-70
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