01What the video shows
A Hikvision PTZ (pan-tilt-zoom) dome camera mounted on a steel pole, with a weatherproof junction box on the pole housing the cable connections. Behind it is a multi-storey building under construction, the kind of open, changing site where a PTZ camera earns its place.
Alongside the PTZ, fixed bullet cameras cover specific areas such as entrances, boundaries and parking, so there's always a recorded view of the key points even while the PTZ is zoomed in elsewhere.
02Why a PTZ plus bullet cameras
A PTZ camera can pan around, tilt and zoom in, so one camera can watch a large area and follow activity or read detail at a distance. Its limitation is that it looks at one place at a time. Bullet cameras fill that gap with fixed, always-recorded views.
Together they give both: continuous coverage of fixed points and a camera that can be steered to whatever is happening. See CCTV camera types: dome vs bullet vs turret vs PTZ.
03Outdoor installation details that matter
Outdoor cameras need a rigid mount (a PTZ on a flimsy pole shakes in the wind and the image blurs when zoomed), sealed cable joints in a proper junction box, surge protection, and a power supply that keeps the cameras recording through outages.
On construction sites, cameras are placed high enough to be out of reach and positioned to cover materials storage, entrances and the site perimeter as the building rises. Read CCTV for construction sites and camera positioning and blind spots.
04Frequently asked questions
What is a PTZ camera used for?
Watching a large area with one camera that can pan, tilt and zoom, for example a yard, car park or construction site, and zooming in on detail when needed.
Do I still need fixed cameras if I have a PTZ?
Usually yes. A PTZ only looks one way at a time, so fixed bullet or dome cameras keep recording the key points continuously.
Can I control the PTZ from my phone?
Yes. Hikvision PTZ cameras can be viewed and steered from the Hik-Connect app. See Hik-Connect mobile viewing.