What 15mm at f/1.4 actually gives you
15mm is wide enough to take in interiors, landscapes and architecture without the pronounced edge stretching of an ultra-wide. On the APS-C bodies it covers, it frames like 23mm would on full-frame.
The f/1.4 maximum aperture is about as fast as production lenses get: it gathers a lot of light and throws backgrounds well out of focus, at the cost of a depth of field thin enough that focus accuracy starts to matter on close subjects.
Size, close focus and filters
At 219g (7.7 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.
Maximum magnification is 0.26x, enough for close-up work on flowers or detail shots without reaching genuine macro reproduction. It focuses as close as 12cm.
Filters are 55mm — 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 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.
