Constant f2.8 Maximum Aperture
Constant F2.8 max aperture maintains exposure and depth of field regardless of the focal range to which you zoom. When changing your aperture to defocus the background, the areas out of the focal plane appear blurred. This ‘bokeh’ effect of the blurred background is enhanced with circular aperture blades used in this lens.
Uncompromising G Master Design
In order to take full advantage of modern high-resolution image sensors, Sony’s G Master lenses are designed for high contrast performance at any focal length or zoom setting. These lenses combine smooth bokeh and high resolution for incredibly clear and detailed image reproduction with superior contrast throughout every frame. G Master achieves the rare combination of high resolving power and beautifully rendered background defocus.
This lens features two extreme aspherical (XA) elements with extremely high surface precision (better that 0.01-micron) and three aspherical elements that work together to minimize aberrations which frequently plague wide-angle lenses. Distortion, field curvature and astigmatism is effectively controlled and the extremely precise XA elements reduce aberration and deliver ultimate corner-to-corner resolution throughout the entire zoom and aperture range.
ED Glass Elements
Two ED (Extra-low Dispersion) glass elements take axial chromatic aberration and chromatic aberration due to differences in magnification out of the picture, maximizing resolution and bokeh while leaving precisely rendered edges with minimal fringing or unnatural coloration.
Two Direct Drive Supersonic Wave Motors (DDSSM)
High-resolution cameras demand absolute focus precision. A floating mechanism driven by two DDSSM (Direct Drive Super Sonic Wave Motor) actuators maintains outstanding resolution from infinity to close focus for both stills and movies. DDSSM has the capability to position the large, heavy optical assemblies required by large-aperture lenses with pinpoint precision, offering accurate, fast and quiet autofocus. Manual focus response is natural and intuitive with the DDSSM system.
Nano AR Coating
Sony’s original Nano AR Coating technology minimizes flare and ghosting by suppressing internal reflections and maintaining clarity, even in difficult outdoor lighting conditions, for dynamic range that achieves lifelike detail and gradation with advanced camera sensors. This precisely defined regular nano-structure allows accurate light transmission, contributing to high-quality images, more so than with lenses that use coatings with an irregular nano-structure. The reflection suppression characteristic of the Nano AR Coating is superior to conventional anti-reflective coatings, providing a notable improvement in clarity, contrast, and overall image quality.
11-Blade Circular Aperture
When changing your aperture to defocus the background, light sources appear blurred. This ‘bokeh’ effect of the blurred background is enhanced with the 11-blade circular aperture used in this lens. Conventional aperture blades have flat sides creating unappealing, polygonal-shaped defocused points of light. α lenses overcome this problem through a 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.
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