What 100mm at f/2.8 actually gives you
100mm is the classic portrait range — long enough to compress features flatteringly without forcing you across the room.
f/2.8 is the working standard for a fast lens — a stop or two of low-light headroom over a kit zoom, and noticeably more background separation.
Size and filters
At 700g (1.54 lb) it has real presence on the front of a camera, though it stays hand-holdable for a session.
Filters are 72mm — 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 and stabilisation
Autofocus is driven by a DDSSM motor.
Optical stabilisation is built in, which stacks with in-body stabilisation on bodies that have it and does the work alone on bodies that do not.
