It is diameter of Filter that can be attached to LensFilter Thread: 67 mm
A larger aperture can allow more light than a smaller one for better, brighter photography in low lightAperture Range: f/4.0 - f/22
Larger Focal Length results in higher magnificationFocal Length Range: 24-70 mm
The Sony Vario-Tessar T* FE 24-70mm f/4 ZA OSS Lens is a wide-angle to portrait-length zoom lens that features a constant f/4 maximum aperture to support consistent performance in regard to exposure settings and focus placement throughout the zoom range. Five aspherical elements and one extra-low dispersion element help to reduce aberrations and distortions while contributing to notable image sharpness and clarity. A Carl Zeiss T* anti-reflective coating has also been applied to lens elements to reduce lens flare and ghosting for improved contrast and color fidelity.
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