Sony's legendary Zeiss 135mm — the ZA Sonnar T* f/1.8 with extraordinary rendering for A-mount.
The Sony 135mm f/1.8 ZA Sonnar T* is a premium portrait and telephoto prime from Sony's Zeiss Alpha (ZA) line for the Sony A-mount, developed in partnership with Zeiss and bearing the Sonnar optical design designation. Introduced in 2006, it quickly established itself as one of the most capable lenses in the Sony A-mount system.
The lens delivers 135mm at f/1.8 maximum aperture with a Zeiss Sonnar T* optical formula, Zeiss T* anti-reflection multi-coating, Sony's SSM (Super Sonic Motor) for fast and quiet autofocus, internal focusing, and full-frame coverage. The Sonnar design prioritises smooth rendering characteristics alongside sharpness.
The 135mm f/1.8 is a demanding specification — the Zeiss-designed optical formula achieves high sharpness even wide open while maintaining the smooth, characterful rendering Sonnar designs are valued for. It was among Sony's most prestigious A-mount lenses for portrait, fashion, and event photography, and retains strong demand in the used market.
Verify SSM autofocus operates smoothly and quietly. Check aperture blades for oil contamination, which is critical at f/1.8 where blade sluggishness directly impacts the distinctive bokeh rendering. Test focus accuracy at portrait distances. Inspect the front element T* coating for any cleaning damage or abrasion.