{"product_id":"contax-21mm-f4-5-biogon-1273283","title":"Zeiss Contax 21mm f4.5 Biogon 1273283 - 1765593","description":"\u003ch2\u003eContax 21mm f4.5 Biogon 1273283 - 1765593\u003c\/h2\u003e\n\u003cp\u003eThis Contax 21mm f4.5 Biogon Lens, #1273283, is in great condition with minor handling wear. I rate it cosmetically a (9). The focus and aperture rings are smooth, the aperture functions properly, and the glass is clean and clear with no haze, marks, or fungus. There are a few faint specks of dust inside, but they do not affect image quality. This lens includes front \u0026amp; rear caps. Please refer to the photos for details.\u003c\/p\u003e\n\u003ch5\u003eWhat Our Experts Think\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli data-start=\"212\" data-end=\"355\"\u003e\n\u003cstrong data-start=\"214\" data-end=\"241\"\u003eSuperior Optical Design\u003c\/strong\u003e – The \u003cstrong data-start=\"248\" data-end=\"266\"\u003eBiogon formula\u003c\/strong\u003e delivers \u003cstrong data-start=\"276\" data-end=\"302\"\u003eedge-to-edge sharpness\u003c\/strong\u003e, minimal distortion, and excellent color accuracy.\u003c\/li\u003e\n\u003cli data-start=\"356\" data-end=\"510\"\u003e\n\u003cstrong data-start=\"358\" data-end=\"390\"\u003eUltra-Wide 21mm Focal Length\u003c\/strong\u003e – Provides a \u003cstrong data-start=\"404\" data-end=\"436\"\u003ebroad, immersive perspective\u003c\/strong\u003e, perfect for \u003cstrong data-start=\"450\" data-end=\"507\"\u003elandscapes, architecture, and documentary photography\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli data-start=\"511\" data-end=\"664\"\u003e\n\u003cstrong data-start=\"513\" data-end=\"531\"\u003ef\/4.5 Aperture\u003c\/strong\u003e – Ensures \u003cstrong data-start=\"542\" data-end=\"583\"\u003ehigh contrast and deep depth of field\u003c\/strong\u003e, making it great for \u003cstrong data-start=\"605\" data-end=\"635\"\u003esharp, well-defined images\u003c\/strong\u003e even at smaller apertures.\u003c\/li\u003e\n\u003cli data-start=\"665\" data-end=\"815\"\u003e\n\u003cstrong data-start=\"667\" data-end=\"689\"\u003eMinimal Distortion\u003c\/strong\u003e – Unlike many wide-angle lenses, the \u003cstrong data-start=\"727\" data-end=\"773\"\u003eBiogon design eliminates barrel distortion\u003c\/strong\u003e, ensuring straight lines stay straight.\u003c\/li\u003e\n\u003cli data-start=\"816\" data-end=\"939\"\u003e\n\u003cstrong data-start=\"818\" data-end=\"844\"\u003ePrecision Manual Focus\u003c\/strong\u003e – Smooth, precise focusing allows for \u003cstrong data-start=\"883\" data-end=\"936\"\u003efine control over composition and subject clarity\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli data-start=\"940\" data-end=\"1059\"\u003e\n\u003cstrong data-start=\"942\" data-end=\"974\"\u003eClassic Contax Craftsmanship\u003c\/strong\u003e – Built with \u003cstrong data-start=\"988\" data-end=\"1009\"\u003epremium materials\u003c\/strong\u003e, ensuring durability and long-term reliability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003eQ\u0026amp;A\u003c\/h5\u003e\n\u003cp data-start=\"0\" data-end=\"353\"\u003e\u003cstrong data-start=\"0\" data-end=\"44\"\u003eQ: What is the Contax 21mm f\/4.5 Biogon?\u003c\/strong\u003e\u003cbr data-start=\"44\" data-end=\"47\"\u003eA: The Contax 21mm f\/4.5 Biogon is an ultra-wide-angle lens designed by Carl Zeiss for Contax rangefinder cameras. It is known for its exceptional optical quality, minimal distortion, and superb edge-to-edge sharpness, making it highly desirable for architectural, landscape, and documentary photography.\u003c\/p\u003e\n\u003cp data-start=\"355\" data-end=\"624\"\u003e\u003cstrong data-start=\"355\" data-end=\"391\"\u003eQ: What makes this lens special?\u003c\/strong\u003e\u003cbr data-start=\"391\" data-end=\"394\"\u003eA: The Biogon design offers outstanding image quality with near-zero distortion, a hallmark of Zeiss engineering. Its compact size and precise craftsmanship make it a legendary wide-angle lens among collectors and photographers.\u003c\/p\u003e\n\u003cp data-start=\"626\" data-end=\"861\"\u003e\u003cstrong data-start=\"626\" data-end=\"677\"\u003eQ: Is this lens compatible with modern cameras?\u003c\/strong\u003e\u003cbr data-start=\"677\" data-end=\"680\"\u003eA: Originally designed for Contax rangefinders, this lens can be adapted for use on modern mirrorless cameras with the right adapter, though rangefinder coupling may not function.\u003c\/p\u003e\n\u003cp data-start=\"863\" data-end=\"1078\"\u003e\u003cstrong data-start=\"863\" data-end=\"900\"\u003eQ: What condition is the lens in?\u003c\/strong\u003e\u003cbr data-start=\"900\" data-end=\"903\"\u003eA: The serial number indicates a specific production batch, but condition details such as glass clarity, mechanics, and cosmetic wear would need to be assessed individually.\u003c\/p\u003e\n\u003ch5\u003eMaintenance Tips\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli data-start=\"61\" data-end=\"243\"\u003e\n\u003cstrong data-start=\"63\" data-end=\"83\"\u003eGentle Cleaning:\u003c\/strong\u003e Use a blower or soft brush to remove dust. Clean the glass with a microfiber cloth and lens-safe solution, applying minimal pressure to preserve the coating.\u003c\/li\u003e\n\u003cli data-start=\"244\" data-end=\"408\"\u003e\n\u003cstrong data-start=\"246\" data-end=\"281\"\u003eAvoid Scratches \u0026amp; Coating Wear:\u003c\/strong\u003e The Biogon’s large front element is prone to flare and scratches—always use a lens cap when not in use and handle with care.\u003c\/li\u003e\n\u003cli data-start=\"409\" data-end=\"594\"\u003e\n\u003cstrong data-start=\"411\" data-end=\"442\"\u003eStore in a Dry Environment:\u003c\/strong\u003e Prevent fungus and moisture buildup by keeping the lens in a cool, dry place with silica gel packs. Avoid high humidity and temperature fluctuations.\u003c\/li\u003e\n\u003cli data-start=\"595\" data-end=\"737\"\u003e\n\u003cstrong data-start=\"597\" data-end=\"628\"\u003eCheck for Smooth Operation:\u003c\/strong\u003e Regularly turn the focus ring and aperture dial to prevent stiffness or seizing from long-term inactivity.\u003c\/li\u003e\n\u003cli data-start=\"738\" data-end=\"870\"\u003e\n\u003cstrong data-start=\"740\" data-end=\"772\"\u003eProtect the Mount \u0026amp; Housing:\u003c\/strong\u003e Ensure the lens mount is clean and free of dust or debris before attaching it to a camera body.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Zeiss","offers":[{"title":"Default Title","offer_id":45420379701308,"sku":null,"price":390.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/6151\/5324\/files\/1765593-00.jpg?v=1778848374","url":"https:\/\/e-powergo.com\/products\/contax-21mm-f4-5-biogon-1273283","provider":"Set Up Your Ultimate Retreat","version":"1.0","type":"link"}