Sony's APS-C power zoom with constant f/4 — a video favourite covering 27-158mm equivalent with OSS.
The Sony E PZ 18-105mm f/4 G OSS was released in 2013 as the constant f/4 APS-C power zoom for Sony E-mount bodies, designed with smooth motorised zoom for video recording. PZ (Power Zoom) indicates an electronic zoom ring with motorised control for smooth, consistent zoom transitions. Covering 27-157.5mm equivalent, it provides wide-to-telephoto coverage at constant f/4. OSS stabilisation is built in. At 427g and 72mm filter thread it is moderate for an APS-C G-series zoom.
The optical design uses 16 elements in 12 groups. Seven aperture blades. The 72mm filter thread is larger than typical APS-C compact zooms. At 427g the lens is moderate. Minimum focus distance of 0.45m at 18mm. OSS provides handheld and video stabilisation. Power zoom ring enables smooth, motorised zoom transitions. Constant f/4 aperture throughout. Sony E native communication.
The motorised power zoom is the PZ 18-105mm's defining feature for video: manual zoom rings produce variable-speed transitions that appear uneven in recorded footage, while the motorised PZ enables smooth, consistent zoom speed suited to documentary and event video. The constant f/4 aperture prevents exposure changes during a zoom shot. OSS provides stabilisation for handheld video work.
On the used market the Sony E PZ 18-105mm f/4 G OSS is affordable as a video-capable APS-C power zoom. Condition checks: PZ zoom motor engagement — confirm smooth, consistent zoom speed — OSS operation, and 72mm front element for marks. Compatible with all Sony APS-C E-mount bodies; on full-frame FE bodies the lens activates APS-C crop mode.