Sony's cinema power zoom — same as ID 1213, possible duplicate of the FE PZ 28-135mm f/4 G OSS.
The Sony FE 28-135mm f/4 G PZ OSS was released approximately 2014 as a power-zoom (PZ) standard zoom for Sony FE full-frame cameras and Sony's FS-series cinema camcorders. The PZ motorised zoom enables smooth zoom speed control during video recording. G series optics; OSS stabilisation. Sony FE mount.
f/4 constant aperture. 28-135mm zoom range. PZ (Power Zoom — motorised). G series optics. OSS (optical steady shot). Full-frame coverage. At approximately 1,160g. 95mm filter thread. Sony FE mount.
The power zoom is the defining feature for video use: the motorised zoom provides smooth, consistent zoom speed for broadcast and cinema applications on FS5, FS7, and FX9-series cameras, as well as on A7-series stills cameras. The f/4 constant aperture maintains exposure across the zoom range. At 1,160g and 95mm filter thread, it is a large and heavy lens by mirrorless standards.
On the used market the Sony FE 28-135mm f/4 G PZ OSS is a video-oriented power-zoom for Sony full-frame cameras and cinema camcorders. Condition checks: PZ motor function (zoom speed lever), OSS engagement, 95mm front element for marks, Sony FE mount contacts.