{"product_id":"cpl-pl-polarizing-filter-industrial-camera-machine-vision-lens","title":"CPL \/ PL Polarizing Filter for Industrial Camera \u0026 Machine Vision Lenses — UV, CPL \u0026 Linear, 25.5mm–77mm + C-Mount","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eCPL \u0026amp; PL Polarizing Filters for Industrial Cameras \u0026amp; Machine Vision Lenses — Reduce Glare, Eliminate Reflections in Inspection Systems\u003c\/h2\u003e\n\u003cp\u003eSurface reflections and specular glare are among the most persistent image quality problems in machine vision inspection, PCB surface analysis, and industrial camera setups — causing false rejects, missed defects, and inconsistent imaging results. These CPL and PL polarizing filters for industrial cameras and machine vision lenses are designed to eliminate surface reflections and control polarized light in FA lens systems, giving engineers and system integrators clean, high-contrast images without post-processing workarounds.\u003c\/p\u003e\n\u003cp\u003eAvailable in 24 variants covering thread sizes from 25.5mm to 77mm and C-Mount direct-mount options, the filters are offered in three types: \u003cstrong\u003eUV filters\u003c\/strong\u003e (dust protection, 27mm and 35.5mm), \u003cstrong\u003eCPL circular polarizing filters\u003c\/strong\u003e (standard choice for most inspection applications), and \u003cstrong\u003ePL linear polarizing filters\u003c\/strong\u003e (for cross-polarization setups, stress analysis, and LCD inspection). Thread pitch is P0.5 for smaller diameters (25.5mm–40.5mm) and P0.75 for larger diameters (43mm–77mm). The glass element is typically 3mm smaller than the thread diameter, and the overall outer body is typically 3mm larger than the glass. \u003cstrong\u003eImportant: always verify the filter thread specification in your lens datasheet — do not measure with a ruler.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTypical use cases include mounting a CPL filter on a Hikvision or Computar FA lens to eliminate specular reflections from glossy PCB surfaces or metal parts during automated optical inspection (AOI), using a C-Mount rear-mounted CPL or PL filter on lenses with convex front elements where front-thread attachment is not practical, and setting up cross-polarization illumination systems (PL filter on lens + PL film on light source) for surface defect detection on reflective materials such as glass, plastic, or coated metal.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-compat\"\u003e\n  \u003cspan class=\"hdiy-compat-icon\"\u003e🔗\u003c\/span\u003e\n  \u003cstrong\u003eCompatibility\u003c\/strong\u003e\n  \u003cul class=\"hdiy-list\"\u003e\n    \u003cli\u003e🔬 \u003cstrong\u003eFront-mount threaded variants (25.5mm–77mm):\u003c\/strong\u003e Screw directly into the filter thread of FA \/ machine vision lenses — verify thread diameter and pitch (P0.5 or P0.75) in your lens datasheet\u003c\/li\u003e\n    \u003cli\u003e📷 \u003cstrong\u003eC-Mount variants:\u003c\/strong\u003e Mount between C-mount lens and camera body — suitable for lenses with convex front elements or where front-thread access is not available\u003c\/li\u003e\n    \u003cli\u003e✅ Compatible with FA lenses from Hikvision, Computar, Kowa, Tamron, Fujinon, Ricoh, and other machine vision lens manufacturers using standard metric filter threads\u003c\/li\u003e\n    \u003cli\u003e⚠️ \u003cstrong\u003eDo not measure thread size with a ruler\u003c\/strong\u003e — always look up the filter thread specification in your lens’s official datasheet or user manual\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These CPL \u0026amp; PL Polarizing Filters for Industrial Camera Lenses\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔭\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e24 Variants — UV, CPL \u0026amp; PL Types\u003c\/strong\u003e — Covers UV dust protection, CPL circular polarizing, and PL linear polarizing in thread sizes from 25.5mm to 77mm plus C-Mount options, giving machine vision engineers a single source for all polarizing filter needs.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💡\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eEliminates Surface Reflections in AOI Systems\u003c\/strong\u003e — CPL filters suppress specular glare from glossy PCB surfaces, metal parts, and coated materials, improving contrast and defect detection consistency in automated optical inspection setups.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eCross-Polarization Support with PL Variants\u003c\/strong\u003e — PL linear polarizing filters enable cross-polarization setups when paired with a linearly polarized light source, revealing surface stress, birefringence, and subsurface features invisible under standard illumination.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔙\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eC-Mount Rear-Mount Options\u003c\/strong\u003e — C-Mount CPL and PL variants mount between the lens and camera body, making them suitable for FA lenses with convex front elements or recessed filter threads where front-mount access is not practical.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003ePrecision Thread Pitch P0.5 \u0026amp; P0.75\u003c\/strong\u003e — Fine-pitch metric threads (P0.5 for 25.5–40.5mm, P0.75 for 43–77mm) match the non-standard thread pitches used on industrial FA lenses — not interchangeable with standard photographic filter threads.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eUV Variants for Lens Protection\u003c\/strong\u003e — UV filters in 27mm and 35.5mm (P0.5) serve as dust and debris protection covers for the lens front element in factory and lab environments without affecting visible-light imaging performance.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003e📐 Technical Specifications — CPL \/ PL Polarizing Filters for Industrial Camera \u0026amp; Machine Vision Lenses\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eFilter Types Available\u003c\/th\u003e\n\u003ctd\u003eUV (dust protection), CPL (circular polarizing), PL (linear polarizing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Diameter Range\u003c\/th\u003e\n\u003ctd\u003e25.5mm, 27mm, 30.5mm, 34mm, 35.5mm, 37.5mm, 39mm, 40.5mm, 43mm, 48mm, 49mm, 52mm, 55mm, 58mm, 62mm, 67mm, 77mm + C-Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eP0.5 (25.5mm–40.5mm variants) \/ P0.75 (43mm–77mm variants)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGlass Diameter\u003c\/th\u003e\n\u003ctd\u003eTypically thread diameter minus 3mm (e.g., 27mm thread → ≈24mm glass)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOverall Outer Diameter\u003c\/th\u003e\n\u003ctd\u003eTypically glass diameter plus 3mm (e.g., ≈27mm glass → ≈30mm OD)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eC-Mount Variants\u003c\/th\u003e\n\u003ctd\u003eCPL (rear-mount), PL (rear-mount), PL Inner Card (rear-mount)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDefault Filter Type\u003c\/th\u003e\n\u003ctd\u003eCPL (circular polarizing) — PL (linear) available as separate variants\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Application\u003c\/th\u003e\n\u003ctd\u003eAOI, PCB inspection, surface defect detection, cross-polarization setups, microscopy, machine vision\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Lens Brands\u003c\/th\u003e\n\u003ctd\u003eHikvision, Computar, Kowa, Tamron, Fujinon, Ricoh, and other FA \/ machine vision lens manufacturers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePackage Contents\u003c\/th\u003e\n\u003ctd\u003e1 × filter (type as selected)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-note\"\u003e\n  \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n  \u003cstrong\u003eHow to find the correct size — do not measure with a ruler\u003c\/strong\u003e\n  \u003cul class=\"hdiy-list\"\u003e\n    \u003cli\u003e📖 Look up the \u003cstrong\u003efilter thread specification\u003c\/strong\u003e in your lens’s official datasheet or user manual — it is typically listed as “Filter Thread: M27 × 0.5” or similar\u003c\/li\u003e\n    \u003cli\u003e🔢 The number in the variant name (e.g., “27mm”) is the \u003cstrong\u003efilter thread diameter\u003c\/strong\u003e — not the lens outer diameter or glass element diameter\u003c\/li\u003e\n    \u003cli\u003e🔩 Both the \u003cstrong\u003ethread diameter and pitch\u003c\/strong\u003e must match your lens spec exactly — wrong pitch = will not thread on correctly\u003c\/li\u003e\n    \u003cli\u003e❌ Do \u003cstrong\u003enot\u003c\/strong\u003e measure the lens front with a ruler — the thread diameter cannot be accurately determined this way\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I find the correct filter thread size for my industrial lens?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eDo not measure the lens front element with a ruler — this will not give you the thread diameter accurately. Instead, look up the filter thread specification in your lens’s official datasheet or user manual. It is typically listed as a thread diameter and pitch, for example \u003cem\u003eM27 × 0.5\u003c\/em\u003e or \u003cem\u003e35.5mm × P0.5\u003c\/em\u003e. The thread diameter listed in the spec sheet is the number you use to select the correct filter variant from the Type selector above.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between CPL (circular polarizing) and PL (linear polarizing) filters?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA \u003cstrong\u003eCPL (circular polarizing) filter\u003c\/strong\u003e uses a quarter-wave plate after the linear polarizer to convert linearly polarized light into circularly polarized light. This is the standard choice for most machine vision and industrial inspection applications. A \u003cstrong\u003ePL (linear polarizing) filter\u003c\/strong\u003e passes only linearly polarized light and is used in specific applications such as stress analysis, LCD panel inspection, or cross-polarization setups where a matched linear polarizer is placed on the illumination source.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does the thread size label mean? For example, what does “27mm*P0.5” mean?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe first number (e.g., \u003cstrong\u003e27mm\u003c\/strong\u003e) is the filter thread diameter — the size of the thread that screws into your lens. The second number after “P” (e.g., \u003cstrong\u003eP0.5\u003c\/strong\u003e) is the thread pitch in millimeters — the distance between thread crests. Both must match your lens specification exactly. The glass element is typically 3mm smaller than the thread diameter (e.g., a 27mm thread has approximately 24mm of glass), and the overall outer body diameter is typically 3mm larger than the glass (approximately 30mm OD for a 27mm thread filter).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is a UV filter used for in machine vision and industrial camera setups?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eIn machine vision and industrial camera applications, UV filters are primarily used as \u003cstrong\u003edust and debris protection covers\u003c\/strong\u003e for the lens front element rather than for UV blocking. They protect the lens from dust, particles, and accidental contact in factory or lab environments without affecting the optical path for visible-light imaging. The UV variants in this product are available in 27mm and 35.5mm (P0.5 pitch).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these filters suitable for outdoor or harsh industrial environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese filters are designed for industrial and machine vision use in typical indoor factory and lab environments. The metal housing provides reasonable durability for regular use. They are not sealed or rated for outdoor weatherproof or IP-rated enclosure applications. For outdoor or high-humidity environments, additional camera housing protection is generally recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich industrial camera and lens brands are compatible with these filters?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese filters are compatible with any industrial FA lens that uses a standard metric filter thread matching the available sizes (25.5mm to 77mm, pitch P0.5 or P0.75). This includes lenses from Hikvision, Computar, Kowa, Tamron, Fujinon, Ricoh, and other machine vision lens manufacturers. The C-Mount variants fit directly onto C-mount camera bodies. Always verify the filter thread specification in your lens datasheet before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use a CPL filter on a lens with a convex or protruding front element?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor lenses with a convex or protruding front element, front-mounted filters may not seat correctly or may contact the glass. In these cases, the \u003cstrong\u003eC-Mount rear-mounted CPL or PL variants\u003c\/strong\u003e in this product are generally recommended. They mount between the lens and camera body, making them suitable for lenses where front filter attachment is not practical. This is a common configuration for wide-angle FA lenses used in machine vision systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n  🛒 Select your filter type above — verify thread diameter and pitch in your lens datasheet first — then add to cart.\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"27mm*P0.5 UV Filter (Dust Proof)","offer_id":52316360704274,"sku":"HKTBXJA350001","price":24.0,"currency_code":"USD","in_stock":true},{"title":"35.5mm*P0.5 UV Filter (Dust Proof)","offer_id":52316360737042,"sku":"HKTBXJA350002","price":24.0,"currency_code":"USD","in_stock":true},{"title":"30.5mm*P0.5 CPL Circular Polarizing Filter","offer_id":52316360769810,"sku":"HKTBXJA350003","price":35.0,"currency_code":"USD","in_stock":true},{"title":"C-Mount CPL Filter for Industrial Camera","offer_id":52316360802578,"sku":"HKTBXJA350004","price":35.0,"currency_code":"USD","in_stock":true},{"title":"25.5mm*P0.5 CPL Circular Polarizing Filter","offer_id":52316360835346,"sku":"HKTBXJA350005","price":35.0,"currency_code":"USD","in_stock":true},{"title":"27mm*P0.5 CPL Circular Polarizing Filter","offer_id":52316360868114,"sku":"HKTBXJA350006","price":35.0,"currency_code":"USD","in_stock":true},{"title":"34mm*P0.5 CPL Circular Polarizing Filter","offer_id":52316360900882,"sku":"HKTBXJA350007","price":35.0,"currency_code":"USD","in_stock":true},{"title":"35.5mm*P0.5 CPL Circular Polarizing Filter","offer_id":52316360933650,"sku":"HKTBXJA350008","price":35.0,"currency_code":"USD","in_stock":true},{"title":"37.5mm*P0.5 CPL Circular Polarizing Filter","offer_id":52316360966418,"sku":"HKTBXJA350009","price":35.0,"currency_code":"USD","in_stock":true},{"title":"39mm*P0.5 CPL Circular Polarizing Filter","offer_id":52316360999186,"sku":"HKTBXJA350010","price":35.0,"currency_code":"USD","in_stock":true},{"title":"40.5mm*P0.5 CPL Circular Polarizing Filter","offer_id":52316361031954,"sku":"HKTBXJA350011","price":35.0,"currency_code":"USD","in_stock":true},{"title":"43mm*P0.75 CPL Circular Polarizing Filter","offer_id":52316361064722,"sku":"HKTBXJA350012","price":35.0,"currency_code":"USD","in_stock":true},{"title":"49mm*P0.75 CPL Circular Polarizing Filter","offer_id":52316361097490,"sku":"HKTBXJA350013","price":35.0,"currency_code":"USD","in_stock":true},{"title":"55mm*P0.75 CPL Circular Polarizing Filter","offer_id":52316361130258,"sku":"HKTBXJA350014","price":35.0,"currency_code":"USD","in_stock":true},{"title":"58mm*P0.75 CPL Circular Polarizing Filter","offer_id":52316361163026,"sku":"HKTBXJA350015","price":35.0,"currency_code":"USD","in_stock":true},{"title":"62mm*P0.75 CPL Circular Polarizing Filter","offer_id":52316361195794,"sku":"HKTBXJA350016","price":40.0,"currency_code":"USD","in_stock":true},{"title":"67mm*P0.75 CPL Circular Polarizing Filter","offer_id":52316361228562,"sku":"HKTBXJA350017","price":40.0,"currency_code":"USD","in_stock":true},{"title":"77mm*P0.75 CPL Circular Polarizing Filter","offer_id":52316361261330,"sku":"HKTBXJA350018","price":45.0,"currency_code":"USD","in_stock":true},{"title":"C-Mount PL Linear Polarizing Filter for Industrial Camera","offer_id":52316361294098,"sku":"HKTBXJA350019","price":35.0,"currency_code":"USD","in_stock":true},{"title":"27mm P0.5 PL Linear Polarizing Filter","offer_id":52316361326866,"sku":"HKTBXJA350020","price":35.0,"currency_code":"USD","in_stock":true},{"title":"48mm P0.75 CPL Filter with PL Film","offer_id":52316361359634,"sku":"HKTBXJA350021","price":35.0,"currency_code":"USD","in_stock":true},{"title":"48mm P0.75 PL Linear Polarizing Filter with PL Film","offer_id":52316361392402,"sku":"HKTBXJA350022","price":35.0,"currency_code":"USD","in_stock":true},{"title":"C-Mount Inner Card PL Linear Polarizing Filter for Industrial Camera","offer_id":52316361425170,"sku":"HKTBXJA350023","price":35.0,"currency_code":"USD","in_stock":true},{"title":"52mm*P0.75 CPL Circular Polarizing Filter","offer_id":52316361457938,"sku":"HKTBXJA350024","price":35.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/O1CN01ApYBTI1Sl26RoHvjR__135462286_38c9407c-d418-4870-b670-69e2e7a620d4.jpg?v=1780500669","url":"https:\/\/homediyer.com\/de\/products\/cpl-pl-polarizing-filter-industrial-camera-machine-vision-lens","provider":"HomeDIYer","version":"1.0","type":"link"}