Additionally, a brass bayonet affords improved mounting accuracy and rigidity. Constructed using a Thermally Stable Composite (TSC) material for greater precision and use in wide temperature variations.Rounded nine-blade diaphragm contributes to a smooth and pleasing bokeh quality.The HSM also permits full-time manual focus control simply by rotating the focus ring at any time. Integrated HSM (Hyper Sonic Motor), along with an internal focusing system, realizes quick and quiet autofocus, which is further complemented by an optimized AF algorithm to produce smoother focusing performance.A Super Multi-Layer Coating has been applied to lens elements in order to minimize lens flare and ghosting and contribute to producing contrast-rich and color-neutral imagery, even in backlit conditions.Four aspherical elements are used to help limit distortion and spherical aberrations and also contribute to greater overall sharpness and accurate rendering.
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