Sony 16-35mm f/2.8 Zeiss Vario-Sonnar T* ZA SSM II Lens for Sony A

Sony 16-35mm F/2.8 II Features

• Unmatched ZEISS T* (T-star) Coating: 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.
• Circular Aperture: When 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.
• 3 Aspherical Lens Elements: Aspherical lens design dramatically reduces spherical aberration while also reducing lens size and weight.
• ED (Extra-low Dispersion) Glass: ED glass dramatically reduces chromatic aberration and provides superior contrast across the entire image, even at large aperture settings. Super ED glass provides enhanced compensation for chromatic aberration.
• SSM (Super Sonic wave Motor): SSM is a piezoelectric motor that contributes to smooth and silent AF operation. The motor produces high torque at slow rotation, and provides immediate start and stop responses. It is also extremely quiet, which helps keep autofocusing silent.
• Dust and Moisture Resistant Design: The dust and moisture resistance design makes this lens appropriate for heavy-duty outdoor use, especially when combined with a camera that employs weather resistant measures such as the Sony's a7 series of cameras.
• Internal Focusing: Only the middle groups of the optical system move to achieve focus, so the overall length of the lens does not change when focusing. Other 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 when using a polarizing filter
• Focus Hold Button: Once you've adjusted focus to where you want it, pressing this button on the lens barrel will keep the lens locked to that focusing distance. The preview function can also be assigned to this button through the camera's custom settings.
• Distance Encoder: The distance encoder is a lens component that directly detects the position of the focusing mechanism, and sends a signal to the CPU in order to measure distance to the subject. During flash photography, this data is very useful in calculating how much flash output is appropriate to the scene.
• ADI Flash Metering: when using a flash that has a built-in distance encoder. It provides automatic metering that is virtually unaffected by the reflectance of subjects or backgrounds. Precise distance information is obtained through the encoder, and this data is used to compensate the flash output accordingly
• Improved Internal focusing system: 4x faster subject tracking
• Silent AF and iris (aperture) Drive: ideal for movie capture