What 135mm at f/1.8 actually gives you
135mm is the classic portrait range — long enough to compress features flatteringly without forcing you across the room.
f/1.8 is fast enough to keep shutter speeds up in poor light and to separate a subject from its background clearly.
Size and filters
At 995g (2.19 lb) it has real presence on the front of a camera, though it stays hand-holdable for a session.
Filters are 82mm — worth checking against what you already own, since polarisers and ND filters at this size are reusable across any other lens sharing the thread.
Autofocus, stabilisation and weather sealing
Autofocus is driven by a Multi-focus Stepping 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.
