Viltrox AF 15mm F1.7

The autofocus locks onto my dog's face instantly even when she's running around the living room, and for a lens this wide it's impressively sharp at f/1.7. Weighing only 180g means I can leave it on my camera all day without my wrist getting tired.

I've been using this lens for indoor event shots and the f/1.7 aperture really lets in enough light to avoid raising the ISO too much. The autofocus locks onto faces quickly even in dimly lit rooms. It's impressively compact for such a wide field of view.

The 180g weight makes this a dream for gimbal work — I can shoot handheld for hours without fatigue. At f/1.7, the low-light performance is genuinely impressive for such a compact lens.