{"product_id":"leica-m-21mm-f3-4-asph","title":"Leica M 21mm f3.4 ASPH","description":"\u003ch2 class=\"headline-33-light\"\u003eLeica M 21mm f3.4 ASPH\u003c\/h2\u003e\n\u003cp\u003eThe new Leica Super-Elmar-M 21mm f\/3.4 ASPH. is characterized by superb imaging performance and amazingly compact construction. This powerful combination makes it ideal for many applications, such as landscape or photojournalistic photography. Even at maximum aperture, the lens delivers outstanding rendition of details and optimum contrast up to its closest focusing distance.\u003c\/p\u003e\n\u003cp\u003eThe sophisticated design and construction comprises eight elements - including one with two aspherical surfaces and another four with anomalous partial dispersion - and plays a decisive role in reducing distortion and vignetting to an absolute minimum. The lens is supplied with a metal, screw-mounted lens hood to prevent flare effects and ensure perfect image sharpness.\u003c\/p\u003e\n\u003cp\u003eTo meet the requirements of digital photography, the Leica Super-Elmar-M 21mm f\/3.4 ASPH is a benchmark in all optical performance characteristics. The stray light optimization was implemented on a very high level, allowing for backlit shots with crystal clear contrast. The design of the metal lens hood matches the appearance of the current wide-angle lenses of the Leica M system. This lens hood is also compatible with the Leica Super Elmar-M 24 mm f\/3.8 ASPH and the Leica Summilux-M 35mm\/1.4.\u003c\/p\u003e\n\u003carticle class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-WEB:1ea9347b-b8ea-4ca8-980a-7e11aae3cfcf-137\" data-testid=\"conversation-turn-276\" data-scroll-anchor=\"false\" data-turn=\"assistant\" tabindex=\"-1\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto [--thread-content-margin:--spacing(4)] @w-sm\/main:[--thread-content-margin:--spacing(6)] @w-lg\/main:[--thread-content-margin:--spacing(16)] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\" tabindex=\"-1\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"942ee4fc-3b78-49c8-b71d-9509ed21c363\" dir=\"auto\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+\u0026amp;]:mt-1\" data-message-model-slug=\"gpt-5-mini\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden first:pt-[1px]\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert w-full break-words light markdown-new-styling\"\u003e\n\u003ch5 data-start=\"0\" data-end=\"30\"\u003eWhat Our Experts Think\u003c\/h5\u003e\n\u003cul data-start=\"31\" data-end=\"444\"\u003e\n\u003cli data-start=\"31\" data-end=\"130\"\u003e\n\u003cp data-start=\"33\" data-end=\"130\"\u003e\u003cstrong data-start=\"33\" data-end=\"61\"\u003eLeica M 21 mm f\/3.4 ASPH\u003c\/strong\u003e — premium ultra‑wide‑angle lens with outstanding optical precision\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"131\" data-end=\"208\"\u003e\n\u003cp data-start=\"133\" data-end=\"208\"\u003eASPH (aspherical) elements deliver crisp sharpness and minimal distortion\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"209\" data-end=\"289\"\u003e\n\u003cp data-start=\"211\" data-end=\"289\"\u003eGreat for landscapes, architecture, interiors, and environmental photography\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"290\" data-end=\"374\"\u003e\n\u003cp data-start=\"292\" data-end=\"374\"\u003eCompact, robust design with refined manual focus typical of Leica M‑mount lenses\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"375\" data-end=\"444\"\u003e\n\u003cp data-start=\"377\" data-end=\"444\"\u003eExceptional color rendition and contrast for high‑quality imagery\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5 data-start=\"446\" data-end=\"465\"\u003eProduct Q\u0026amp;A\u003c\/h5\u003e\n\u003cul data-start=\"466\" data-end=\"946\"\u003e\n\u003cli data-start=\"466\" data-end=\"568\"\u003e\n\u003cp data-start=\"468\" data-end=\"568\"\u003e\u003cstrong data-start=\"468\" data-end=\"503\"\u003eWhat focal length is this lens?\u003c\/strong\u003e\u003cbr data-start=\"503\" data-end=\"506\"\u003e21 mm — ultra‑wide perspective ideal for expansive scenes.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"569\" data-end=\"669\"\u003e\n\u003cp data-start=\"571\" data-end=\"669\"\u003e\u003cstrong data-start=\"571\" data-end=\"604\"\u003eWhat is the maximum aperture?\u003c\/strong\u003e\u003cbr data-start=\"604\" data-end=\"607\"\u003ef\/3.4 — balanced light gathering with minimal aberrations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"670\" data-end=\"748\"\u003e\n\u003cp data-start=\"672\" data-end=\"748\"\u003e\u003cstrong data-start=\"672\" data-end=\"699\"\u003eWhat mount does it use?\u003c\/strong\u003e\u003cbr data-start=\"699\" data-end=\"702\"\u003eLeica \u003cstrong data-start=\"710\" data-end=\"721\"\u003eM‑mount\u003c\/strong\u003e for rangefinder cameras.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"749\" data-end=\"824\"\u003e\n\u003cp data-start=\"751\" data-end=\"824\"\u003e\u003cstrong data-start=\"751\" data-end=\"767\"\u003eIs it sharp?\u003c\/strong\u003e\u003cbr data-start=\"767\" data-end=\"770\"\u003eYes — excellent edge‑to‑edge sharpness and detail.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"825\" data-end=\"946\"\u003e\n\u003cp data-start=\"827\" data-end=\"946\"\u003e\u003cstrong data-start=\"827\" data-end=\"870\"\u003eWhat photography styles is it best for?\u003c\/strong\u003e\u003cbr data-start=\"870\" data-end=\"873\"\u003eLandscapes, architecture, travel, interiors, and environmental shots.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5 data-start=\"948\" data-end=\"972\"\u003eMaintenance Tips\u003c\/h5\u003e\n\u003cul data-start=\"973\" data-end=\"1233\"\u003e\n\u003cli data-start=\"973\" data-end=\"1035\"\u003e\n\u003cp data-start=\"975\" data-end=\"1035\"\u003eClean front and rear elements with a soft microfiber cloth\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1036\" data-end=\"1089\"\u003e\n\u003cp data-start=\"1038\" data-end=\"1089\"\u003eUse a lens hood to reduce flare and protect glass\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1090\" data-end=\"1137\"\u003e\n\u003cp data-start=\"1092\" data-end=\"1137\"\u003eStore in a dry, padded case when not in use\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1138\" data-end=\"1181\"\u003e\n\u003cp data-start=\"1140\" data-end=\"1181\"\u003eAvoid touching optics with bare fingers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1182\" data-end=\"1233\"\u003e\n\u003cp data-start=\"1184\" data-end=\"1233\"\u003eKeep caps on when the lens is off the camera body\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"z-0 flex min-h-[46px] justify-start\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/article\u003e\n\u003carticle class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto scroll-mt-(--header-height)\" dir=\"auto\" data-turn-id=\"b7ec2447-b4f7-453d-96c9-3633154f523e\" data-testid=\"conversation-turn-277\" data-scroll-anchor=\"false\" data-turn=\"user\" tabindex=\"-1\"\u003e\u003c\/article\u003e","brand":"Leica","offers":[{"title":"Default Title","offer_id":54162615075100,"sku":"823","price":3845.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0933\/0622\/4924\/files\/823-01_20.jpg?v=1780150524","url":"https:\/\/www.mybackyardzone.com\/products\/leica-m-21mm-f3-4-asph","provider":"Backup Power Made Simple","version":"1.0","type":"link"}