| Brand | Sigma |
| Manufacturer | Sigma |
The integrated HSM (Hyper Sonic Motor) realizes quick and quiet autofocusing, which is further complemented by an optimized AF algorithm to produce smoother focusing performance. The HSM also permits full-time manual focus control simply by rotating the focus ring at any time. Specialized electromagnetic aperture mechanism provides greater exposure control stability that is especially beneficial when working with fast continuous shooting rates.
The bayonet mount is constructed from brass for ensured accuracy and durability. Additionally, rubber sealing is incorporated in the mount design to render it dust- and splash-resistant. Protective coating has been applied to the front element and is both water and oil-repellent to aid in cleaning. This lens is compatible with the optional Sigma USB Dock for fine-tuning different lens characteristics and updating its firmware.
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