This tool is intended for posing and creating screenshots. It is an improved replacement for the Camera tool.
Get it from the workshop: http://steamcommunity.com/sharedfile.../?id=881605937
So what does it do? Quite simple. A camera has its own zoom level (FOV), its own roll angle, and even its own NearZ and FarZ parameters. This enables you to have full control over the composition of your picture, without having to rely on the camera weapon and hope that you don't accidentally reset it.
An advanced camera will never move unless you move it with the physgun.
You can edit and tweak a camera's settings after you've spawned it. Simply open the context menu (hold C by default), right-click the camera and select "Edit properties..."
In fact, you don't even have to spawn it using the tool. You can instead spawn it from the Entities menu.
You can collaborate in multiplayer! Right-click an existing camera and select "Assign Key" to bind a key to use someone else's camera.
Hope you like!