Zeiss Loxia 50mm — same as ID 597, possible duplicate with different canonical name.
The Zeiss Loxia 50mm f/2 Planar T* is a native Sony FE-mount standard prime from Zeiss's Loxia series, designed for full-frame Sony mirrorless cameras. Features manual focus with electronic aperture (De-Click function via manual switch), T* coating, and a clickless aperture option for video. Sony FE mount.
f/2 maximum aperture. 50mm focal length. Planar T* optical design. Native Sony FE mount with electronic coupling. Manual focus. De-Click switch (removes aperture click-stops for smooth iris pulls). At approximately 320g. 52mm filter thread. Sony FE mount.
The Loxia series are Zeiss-designed Sony FE-native manual-focus primes with full electronic coupling — EXIF data, focus confirmation, and aperture-by-wire control. The De-Click switch enables smooth de-clicked aperture changes for video without clicking through stops. The 50mm Planar optical design is a classic Zeiss formula.
On the used market the Zeiss Loxia 50mm f/2 Planar T* Sony FE is a premium manual-focus standard prime for Sony full-frame mirrorless. Condition checks: Sony FE mount electrical contacts, De-Click switch function, focus ring smoothness, 52mm front element and T* coating for marks.