The Sony A 300mm f/2.8G SSM II is an update to the first-generation Sony 300mm f/2.8G SSM. Key features include:

What’s New? The Sony A 300mm f/2.8G SSM II’s autofocus motor features an LSI drive circuit that provides even faster autofocus speeds, with tracking focus speed four times faster than its predecessor’s. Sony also added a premium Nano AR Coating for eliminating internal ghosting and lens flare.

High-Quality Optics. Like its predecessor, the 300 f/2.8G II provides high-contrast images with very smooth background blur. Its optics have been tweaked to further reduce spherical aberration, while its three ED elements help to minimize chromatic aberration at wide apertures.

Advanced Focusing System. It has an internal focusing system that allows the lens to stay the same dimension at all focus distances, with two DMF focus modes for quick manual-focus tweaks. It still has the four focus-hold buttons seen on the original, as well as the focus limit switch with programmable near/far distances for customizing performance.

Durable Construction. Its magnesium construction is substantial yet lightweight, and both the front and back of the lens and focus ring offer weather sealing for shooting in less-than-favorable conditions.