{"product_id":"canon-zoom-lens-ef-17-40mm-f4-l-usm","title":"Canon Zoom Lens EF 17-40mm F4 L USM","description":"\u003cdiv role=\"button\" class=\"group my-4 block w-full cursor-pointer text-start\"\u003e\n\u003cdiv class=\"flex flex-col gap-3 md:flex-row md:items-center md:gap-6\"\u003e\n\u003cdiv class=\"font-['SF_Pro_Text','SF_Pro_Display','SF_Pro',var(--font-sans)] flex min-w-0 flex-col justify-center\"\u003e\n\u003ch3 class=\"text-token-text-primary m-0 line-clamp-2 text-ellipsis text-[22px] leading-[28px] font-[510] tracking-[-0.26px] max-md:text-[18px] max-md:leading-[22px] max-md:font-medium max-md:tracking-[-0.43px]\"\u003eCanon EF 17-40mm f\/4L USM\u003cspan\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cul data-start=\"76\" data-end=\"768\"\u003e\n\u003cli data-start=\"76\" data-end=\"121\"\u003e\n\u003cstrong data-start=\"78\" data-end=\"92\"\u003eLens Type:\u003c\/strong\u003e Ultra Wide-Angle Zoom Lens\u003c\/li\u003e\n\u003cli data-start=\"122\" data-end=\"151\"\u003e\n\u003cstrong data-start=\"124\" data-end=\"134\"\u003eMount:\u003c\/strong\u003e Canon EF Mount\u003c\/li\u003e\n\u003cli data-start=\"152\" data-end=\"202\"\u003e\n\u003cstrong data-start=\"154\" data-end=\"165\"\u003eFormat:\u003c\/strong\u003e Full Frame (compatible with APS-C)\u003c\/li\u003e\n\u003cli data-start=\"203\" data-end=\"232\"\u003e\n\u003cstrong data-start=\"205\" data-end=\"222\"\u003eFocal Length:\u003c\/strong\u003e 17–40mm\u003c\/li\u003e\n\u003cli data-start=\"233\" data-end=\"265\"\u003e\n\u003cstrong data-start=\"235\" data-end=\"248\"\u003eAperture:\u003c\/strong\u003e f\/4 (constant)\u003c\/li\u003e\n\u003cli data-start=\"266\" data-end=\"351\"\u003e\n\u003cstrong data-start=\"268\" data-end=\"287\"\u003eOptical Design:\u003c\/strong\u003e 12 elements in 9 groups \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"352\" data-end=\"378\"\u003e\n\u003cstrong data-start=\"354\" data-end=\"368\"\u003eDiaphragm:\u003c\/strong\u003e 7-blade\u003c\/li\u003e\n\u003cli data-start=\"379\" data-end=\"451\"\u003e\n\u003cstrong data-start=\"381\" data-end=\"396\"\u003eFocus Type:\u003c\/strong\u003e Autofocus (Ring-type USM, Full-time Manual Override)\u003c\/li\u003e\n\u003cli data-start=\"452\" data-end=\"528\"\u003e\n\u003cstrong data-start=\"454\" data-end=\"481\"\u003eMinimum Focus Distance:\u003c\/strong\u003e 0.28 m \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"529\" data-end=\"603\"\u003e\n\u003cstrong data-start=\"531\" data-end=\"557\"\u003eMaximum Magnification:\u003c\/strong\u003e 0.24x \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"604\" data-end=\"668\"\u003e\n\u003cstrong data-start=\"606\" data-end=\"622\"\u003eFilter Size:\u003c\/strong\u003e 77 mm \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"669\" data-end=\"700\"\u003e\n\u003cstrong data-start=\"671\" data-end=\"695\"\u003eImage Stabilization:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli data-start=\"701\" data-end=\"768\"\u003e\n\u003cstrong data-start=\"703\" data-end=\"714\"\u003eWeight:\u003c\/strong\u003e Approx. 475 g \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"770\" data-end=\"773\"\u003e\n\u003cp data-start=\"775\" data-end=\"1118\"\u003e\u003cstrong data-start=\"775\" data-end=\"790\"\u003eDescription\u003c\/strong\u003e\u003cbr data-start=\"790\" data-end=\"793\"\u003eThe Canon EF 17-40mm f\/4L USM is a classic ultra-wide zoom from Canon’s L-series lineup, built for photographers who need reliable wide-angle coverage with professional-grade construction. Covering 17–40mm, it’s well-suited for landscapes, architecture, interiors, and travel photography where expansive framing is essential.\u003c\/p\u003e\n\u003cp data-start=\"1120\" data-end=\"1553\"\u003eIts constant f\/4 aperture provides consistent exposure across the zoom range, while the ring-type USM ensures fast, silent, and precise autofocus. The lens also features weather-resistant construction (when paired with a sealed body), making it dependable for outdoor use. Optical performance emphasizes strong contrast and color typical of L-series lenses, with best results achieved when stopped down—especially for landscape work.\u003c\/p\u003e\n\u003cp data-start=\"1555\" data-end=\"1738\"\u003eLightweight for an L lens and highly practical, the 17-40mm remains a popular choice for photographers looking for an affordable entry into Canon’s professional ultra-wide zoom range.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSerial Number:\u003c\/strong\u003e 3772468\u003cbr\u003e\u003cstrong\u003eSKU:\u003c\/strong\u003e UN-119-1221\u003cbr\u003e\u003cstrong style=\"font-size: 0.875rem;\"\u003e\u003cbr\u003eCondition\u003c\/strong\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e:\u003cbr\u003e- Lens is fully functional\u003cbr\u003e- Front lens cap, rear lens cap, EW-83E hood, and original box included\u003cbr\u003e- Lens glass has no fungus, thin haze, and minor dust\u003cbr\u003e- Lens body has no scratches\u003cbr\u003e\u003cbr\u003e- เลนส์ ทำงานเต็มระบบ\u003cbr\u003e- เลนส์ ไม่มีรา มีฝ้าบางๆ มีฝุ่นเล็กน้อย\u003cbr\u003e- สภาพตัวเลนส์ ไม่มีรอยขีดข่วน\u003cbr\u003e- มีฝาปิดหน้า-หลังเลนส์ มีกล่อง มีHood EW-83E\u003c\/span\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\u003c\/ul\u003e","brand":"CAMERA SHOP UNIT","offers":[{"title":"Default Title","offer_id":46327116365868,"sku":"UN-119-1221","price":8500.0,"currency_code":"THB","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0082\/0654\/9051\/files\/IMG_20260826_165755.jpg?v=1791011743","url":"https:\/\/unit-filmcamera.com\/products\/canon-zoom-lens-ef-17-40mm-f4-l-usm","provider":"UNIT CAMERA SHOP | BKK","version":"1.0","type":"link"}