In photography, bokeh is the aesthetic quality of the blur produced in out-of-focus parts of an image, caused by circles of confusion. Bokeh has also been defined as "the way the lens renders out-of-focus points of light". Differences in lens aberrations and aperture shape cause very different bokeh effects. Some lens designs blur the image in a way that is pleasing to the eye, while others produce distracting or unpleasant blurring. Photographers may deliberately use a shallow focus technique to create images with prominent out-of-focus regions, accentuating their lens's bokeh.
Sigma Corporation is a Japanese company, manufacturing cameras, lenses, flashes and other photographic accessories. All Sigma products are produced in the company's own Aizu factory in Bandai, Fukushima, Japan. Although Sigma produces several camera models, the company is best known for producing high-quality lenses and other accessories that are compatible with the cameras produced by other companies.
In signal processing, apodization is the modification of the shape of a mathematical function. The function may represent an electrical signal, an optical transmission, or a mechanical structure. In optics, it is primarily used to remove Airy disks caused by diffraction around an intensity peak, improving the focus.
Originally produced by Minolta, and currently produced by Sony, the STF 135mm f/2.8 [T4.5] is a photographic lens compatible with cameras using the Minolta AF and Sony α A-mount. STF stands for Smooth Trans Focus, in reference to its special optical system, which is intended to smooth the transition between the plane of focus and out-of-focus areas in the image. This is accomplished by the use of an apodization filter that provides the high-quality bokeh effect. The lens is not a soft-focus lens.
The Smooth Trans Focus (STF) technology in photographic lenses uses an apodization filter to realize notably smooth bokeh with rounded out-of-focus highlights in both the foreground and background. This is accomplished by utilizing a concave neutral-gray tinted lens element next to the aperture blades as apodization filter, a technology originally invented by Minolta in the 1980s, and first implemented in a commercially available lens in 1999. In contrast to soft focus lenses, STF lenses render a perfectly sharp image in the focus plane.
The Sony FE 90mm F2.8 Macro G OSS is a full-frame macro prime lens for the Sony E-mount, announced by Sony on 4 March 2015.
The Sony FE 28mm F2 is a full-frame (FE) wide-angle lens for the Sony E-mount, announced by Sony on March 4, 2015.
The Sony Zeiss Vario-Tessar T* FE 16-35mm F4 ZA OSS is a constant maximum aperture wide-angle full-frame (FE) zoom lens for the Sony E-mount, announced by Sony on September 15, 2014.
The Zeiss Batis Sonnar T* 1.8/85mm is a full-frame (FE) portrait prime lens for the Sony E-mount, announced by Zeiss on April 22, 2015.
The Sony FE 70-200mm F2.8 GM OSS is a premium, constant maximum aperture full-frame (FE) telephoto zoom lens for the Sony E-mount, announced by Sony on February 3, 2016.
The Sony FE 70-200mm F4.0 G OSS is a full-frame constant maximum aperture, telephoto zoom lens for the Sony E-mount, announced by Sony in 2013.
The Venus Optics Laowa 105mm F2 Smooth Trans Focus lens is a smooth trans focus full-frame prime lens for Canon EF, Nikon AI, Sony A, Sony E, and Pentax K mounts, announced by Venus Optics in September 2016. It is marketed as the "Bokeh Dreamer" lens.
The Sony FE 50mm F2.8 Macro is a full-frame macro prime lens for the Sony E-mount, announced by Sony on August 30, 2016.
The Sony FE 85mm F1.4 GM is a premium short telephoto full-frame prime lens for the Sony E-mount, released by Sony on February 3, 2016.
The Sony FE 24-70mm F2.8 GM is a premium constant maximum aperture full-frame (FE) zoom lens for the Sony E-mount, announced by Sony on February 3, 2016.
The Sony FE 16-35mm F2.8 GM is a premium constant maximum aperture wide-angle full-frame (FE) zoom lens for the Sony E-mount, announced by Sony on May 17, 2017. The lens is scheduled for release on August 31, 2017.
The Sony FE 100-400mm F4.5-5.6 GM OSS is a premium, variable maximum aperture full-frame telephoto zoom lens for the Sony E-mount, announced by Sony on April 19, 2017.
The Zeiss Loxia Distagon T* 2/21mm is a full-frame (FE) wide-angle manual focus prime lens for the Sony E-mount, announced by Zeiss on October 12, 2015.
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