二手 Sigma 8-16mm F4.5-5.6 DC HSM AF 鏡頭（Canon 用）

For an ultra-wide zoom on a budget, this used Sigma is a steal — it handles tight interiors and towering landscapes with zero distortion. The build feels solid and the AF is snappy, though you’ll definitely need good light since it’s a slow lens.

Popped this on my Canon for a trip out west and the lens easily captured the whole canyon in one frame. The autofocus feels a bit slow hunting in low light, but for daytime landscapes it's sharp from edge to edge.

The 8-16mm range is a game-changer for interiors—I can finally capture entire rooms without backing into a wall. Focus snaps fast on my Canon, and the used condition honestly looks nearly new, though the slight heft took me a day to get used to.