What 28-70mm at f/2 actually gives you
28-70mm sits close to the way the eye takes in a scene, which is why this range tends to get used as a general-purpose focal length.
f/2 is fast enough to keep shutter speeds up in poor light and to separate a subject from its background clearly.
Size and filters
At 918g (2.02 lb) it has real presence on the front of a camera, though it stays hand-holdable for a session.
Filters are 86mm — worth checking against what you already own, since polarisers and ND filters at this size are reusable across any other lens sharing the thread. A dedicated aperture ring gives direct control without going through a camera dial, which mostly matters for video work. The zoom is internal, so the barrel does not extend and the balance and overall length stay constant.
Autofocus, stabilisation and weather sealing
Autofocus is driven by an XD Linear motor.
There is no optical stabilisation in the lens, so handheld steadiness depends on the body having IBIS, or on keeping the shutter speed up.
The barrel is weather-sealed, so rain and dust are a manageable risk rather than a reason to pack up.
