Provides immense super-telephoto reach, making it an excellent choice for serious wildlife, bird, and distant sports photography.. Features an internal zoom mechanism, meaning the lens length does not change when zooming, which improves balance and helps prevent dust ingress.. Equipped with a Direct Drive SSM (DDSSM) focus system for fast, precise, and quiet autofocus, capable of keeping up with the a1's tracking capabilities.. Despite its long focal length, it offers impressive sharpness and detail, especially for its price point.. Integrated Optical SteadyShot (OSS) is highly effective for handheld shooting at extreme telephoto lengths.

This unique lens offers an incredibly versatile 10x zoom ratio, covering everything from a standard telephoto to an extreme super-telephoto in a single lens.. As a 'Sports' line lens, it boasts a robust, dust- and splash-resistant construction, ideal for challenging outdoor environments.. Utilizes a newly developed HLA (High-response Linear Actuator) motor for fast, quiet, and highly accurate autofocus, perfectly suited for the a1's AF system.. Features Sigma's OS2 optical stabilization algorithm, offering up to 7 stops of stabilization at 60mm and 6 stops at 600mm, greatly enhancing handheld usability.. Delivers excellent optical performance throughout its extensive zoom range, providing sharp images for a variety of subjects.

This unique lens offers an incredibly versatile 10x zoom ratio, covering everything from a standard telephoto to an extreme super-telephoto in a single lens.. As a 'Sports' line lens, it boasts a robust, dust- and splash-resistant construction, ideal for challenging outdoor environments.. Utilizes a newly developed HLA (High-response Linear Actuator) motor for fast, quiet, and highly accurate autofocus, perfectly suited for the a1's AF system.. Features Sigma's OS2 optical stabilization algorithm, offering up to 7 stops of stabilization at 60mm and 6 stops at 600mm, greatly enhancing handheld usability.. Delivers excellent optical performance throughout its extensive zoom range, providing sharp images for a variety of subjects.

Offers an exceptionally wide zoom range starting at 50mm, making it a highly versatile 'all-in-one' travel or general-purpose telephoto zoom, reducing the need to swap lenses.. Despite its broad range, it's remarkably compact and lightweight for a 400mm lens, making it very portable.. Equipped with Tamron's VXD (Voice-coil eXtreme-torque Drive) linear motor focus mechanism, providing very fast, precise, and quiet autofocus performance.. Includes Tamron's VC (Vibration Compensation) image stabilization, which is effective for handheld shooting across its focal range.. Delivers impressive sharpness and image quality, offering excellent value for its performance and versatility.