The ultra-wide 12mm angle of view available with this versatile, makes it possible to emphasize distance and create dynamic perspectives that are beyond the scope of the human eye. 12-24mm zoom with a constant F2.8 maximum aperture is ideal for shooting night scenes, starry skies, and other low-light subjects at low sensitivities without having to use extremely slow shutter speeds.
New optics with the largest XA element
Three XA (extreme aspherical) elements, including the largest ever made for any α lens, combine with one aspherical element in an innovative optical design that achieves stunning G Master resolution throughout the image area.
Minimal aberration enhances sharpness
Two Super ED (Extra-low Dispersion) and three ED glass elements suppress chromatic aberration that can degrade resolution in this type of large-aperture lens, ensuring that colour smearing does not occur anywhere in the image area so that maximum sharpness is maintained throughout.
Surprisingly small and lightweight
An innovative optical design with four aspherical elements, including three XA types, plus a mechanical design that features high-performance XD Linear Motors, in a compact 12-24mm constant F2.8 zoom that weighs only 847 grams. This lens is ideal for landscapes, night scenes, and architecture, while providing extra mobility for active sports shooters who want to use ultra-wide angles.
Crisp images in difficult light
A new Nano AR Coating II that can be evenly applied to large lens elements or highly curved element surfaces has been developed to suppress internal reflections that can cause flare and ghosting for clear, crisp imagery. Despite the lens's wide angle of view, Nano AR Coating II maintains high clarity and contrast throughout the entire image, even in difficult light. ( [A] Conventional coating [B] Nano AR Coating II  Conventional coating  Nano AR Coating II  Glass  Highly curved glass surface  Reflected light )
Gorgeous G Master bokeh
While the extremely high surface precision of the lens’s XA elements effectively suppresses onion-ring bokeh, fine tuning of the its spherical aberration characteristics during both design and manufacture, plus a 9-blade circular aperture, contribute to exquisitely smooth, creamy G Master bokeh.
Dust and moisture resistant design
A dust and moisture resistant design2 provides the reliability needed for outdoor use in challenging conditions.
Constant F2.8 maximum aperture for flexible moviemaking
With a constant F2.8 maximum aperture at all focal lengths, aperture does not change while zooming so that exposure, shutter speed, and ISO sensitivity can remain consistent while shooting movies. When used on an APS-C body or with a Super 35 angle of view, the wide end of the zoom range becomes equivalent to 18mm on a full-frame body, providing a very useful zoom range for moviemaking.
Floating mechanism achieves excellent resolution from infinity to close focus
A floating focus mechanism that divides the lens’s focus group into two independently controllable groups is extremely effective in minimizing aberration that varies with focusing distance. Top performance is maintained from infinity to close-up focus, throughout the entire zoom range. The floating mechanism not only contributes to outstanding close-up performance, but also outstanding sharpness with subjects at any distance.
Rear filter holder
Standard sheet-type ND, color correction, and other filters can be inserted into the lens’s rear filter holder for expanded expressive capability. A cutting template for sheet filters is supplied.
Easy manual/auto focus switching
A focus mode switch that allows instant switching between auto and manual focus modes can be a great advantage when shooting subjects or situations that require fine manual focus adjustment.
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