What 15mm at f/4.5 actually gives you
15mm is wide enough to take in interiors, landscapes and architecture without the pronounced edge stretching of an ultra-wide.
f/4.5 is a slow maximum aperture, so this leans on good light or on a stabilised body.
Size and filters
At 193g (6.8 oz) it is light enough that it stops being a decision — the kind of lens that stays on the body or in the bag without thought.
Filters are 58mm — worth checking against what you already own, since polarisers and ND filters at this size are reusable across any other lens sharing the thread.
Manual focus and stabilisation
Focus is manual only. That suits deliberate work — landscapes, macro, video pulls — and rules it out for anything that moves unpredictably.
There is no optical stabilisation in the lens, so handheld steadiness depends on the body having IBIS, or on keeping the shutter speed up.
