Canon EF 17–40mm f/4L USM Lens. Ring‑type USM autofocus. Autofocus fast and accurate. Canon 17‑40mm f4 L, EF 17‑40mm lens, Canon L‑series ultra‑wide, Canon landscape lens, 17‑40mm heavy wear, Canon EF zoom lens, 17‑40mm chipped rear, fully working Canon lens.
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