{"title":"Home page","description":null,"products":[{"product_id":"precision-digital-negatives-ebook","title":"PDN eBook, Curve Calculator I \u0026 Calibration Palettes","description":"\u003cdiv dir=\"ltr\" aria-busy=\"false\" aria-live=\"off\" id=\"model-response-message-contentr_4d70f7a7fb5a21bc\" class=\"markdown markdown-main-panel tutor-markdown-rendering enable-updated-hr-color\"\u003e\n\u003cp data-path-to-node=\"4\" style=\"text-align: center;\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"4\"\u003ePrecision Digital Negatives: The System \u0026amp; eBook\u003c\/b\u003e\u003c\/p\u003e\n\u003ch6 data-path-to-node=\"4\" style=\"text-align: center;\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"4\"\u003e(Instant Digital Download)\u003cbr\u003e\u003cbr\u003eBy Mark I Nelson\u003c\/b\u003e\u003c\/h6\u003e\n\u003cp data-path-to-node=\"6\"\u003e\u003ci data-index-in-node=\"0\" data-path-to-node=\"6\"\u003eThe complete guide to fabricating digital negatives for Silver, Platinum, Palladium, and other alternative processes. Includes the patented \"Color Density Range Control\" system. Delivered instantly to your inbox.\u003c\/i\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"8\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"8\"\u003eThis is not just another \"how-to\" book.\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"8\"\u003e\u003cb data-index-in-node=\"40\" data-path-to-node=\"8\"\u003ePrecision Digital Negatives\u003c\/b\u003e is a comprehensive \u003cb data-index-in-node=\"87\" data-path-to-node=\"8\"\u003eSYSTEM\u003c\/b\u003e designed to maximize the tonality and smoothness of your final prints. Whether you are printing Silver Gelatin, Platinum\/Palladium, or other alternative processes, this guide bridges the gap between digital precision and analog beauty.\u003c\/p\u003e\n\u003cp data-path-to-node=\"9\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"9\"\u003eThe Core Innovation: Color Density Range Control (Patented)\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"9\"\u003eWhat sets the PDN System apart is the ingenious \u003cb data-index-in-node=\"108\" data-path-to-node=\"9\"\u003eColor Density Range Control\u003c\/b\u003e method.\u003c\/p\u003e\n\u003cul data-path-to-node=\"10\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,0,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"10,0,0\"\u003eThe Problem:\u003c\/b\u003e Traditional methods often rely on drastic \"Process Adjustment Curves\" that can destroy image integrity.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,1,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"10,1,0\"\u003eThe PDN Solution:\u003c\/b\u003e Our patented method matches the density range of your digital negative \u003ci data-index-in-node=\"89\" data-path-to-node=\"10,1,0\"\u003eprecisely\u003c\/i\u003e to the exposure scale of your specific process or contrast mix \u003cb data-index-in-node=\"162\" data-path-to-node=\"10,1,0\"\u003ebefore\u003c\/b\u003e you ever apply a curve.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,2,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"10,2,0\"\u003eThe Result:\u003c\/b\u003e Your required adjustment curves are far less drastic, preserving more original image tones and ensuring the smoothest possible gradients.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"11\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"11\"\u003eWhat You Will Learn:\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"11\"\u003eThis 138-page illustrated guide takes you through the entire workflow:\u003c\/p\u003e\n\u003cul data-path-to-node=\"12\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,0,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"12,0,0\"\u003eCapture:\u003c\/b\u003e Best practices for scanners and digital cameras.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,1,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"12,1,0\"\u003ePreparation:\u003c\/b\u003e Preparing your files for negative creation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,2,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"12,2,0\"\u003eCalibration:\u003c\/b\u003e A step-by-step guide to the PDN Calibration Steps.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,3,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"12,3,0\"\u003eTroubleshooting:\u003c\/b\u003e Understanding \u003ci data-index-in-node=\"31\" data-path-to-node=\"12,3,0\"\u003ewhy\u003c\/i\u003e negatives fail and how to evaluate your prints professionally.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-path-to-node=\"13\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"13\"\u003eWhat is Included (Digital Download):\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul data-path-to-node=\"14\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"14,0,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"14,0,0\"\u003eThe eBook:\u003c\/b\u003e 138 pages of illustrated instruction (PDF Format).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"14,1,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"14,1,0\"\u003eThe Software:\u003c\/b\u003e Curve Calculator III (Excel Spreadsheet) for Mac OS.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"14,2,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"14,2,0\"\u003eThe Tools:\u003c\/b\u003e Digital files of the required calibration palettes for the Precision Digital Negatives System.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"14,3,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"14,3,0\"\u003eDelivery:\u003c\/b\u003e \u003cb data-index-in-node=\"10\" data-path-to-node=\"14,3,0\"\u003eInstant Digital Download.\u003c\/b\u003e (No physical CD will be shipped).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-path-to-node=\"15\"\u003e\n\u003ch3 data-path-to-node=\"16\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"16\"\u003eTable of Contents\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul data-path-to-node=\"17\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,0,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,0,0\"\u003eChapter I:\u003c\/b\u003e Introduction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,1,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,1,0\"\u003eChapter II:\u003c\/b\u003e Digital Basics\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,2,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,2,0\"\u003eChapter III:\u003c\/b\u003e Digital Image Capture\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,3,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,3,0\"\u003eChapter IV:\u003c\/b\u003e Digital Image Preparation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,4,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,4,0\"\u003eChapter V:\u003c\/b\u003e The Precision Digital Negatives Process\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,5,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,5,0\"\u003eChapter VI:\u003c\/b\u003e Alternative Photographic Processes and Digital\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,6,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,6,0\"\u003eChapter VII:\u003c\/b\u003e Inkjet Negatives\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,7,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,7,0\"\u003eChapter VIII:\u003c\/b\u003e Laser and LED Negatives\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,8,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,8,0\"\u003eChapter IX:\u003c\/b\u003e Imagesetter Negatives\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,9,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,9,0\"\u003eChapter X:\u003c\/b\u003e Output Devices Compared\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,10,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,10,0\"\u003eChapter XI:\u003c\/b\u003e Calibration - Variables to Consider\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,11,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,11,0\"\u003eChapter XII:\u003c\/b\u003e Overview of the Calibration Process\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,12,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,12,0\"\u003eChapter XIII:\u003c\/b\u003e Calibration - Step Tablets \u0026amp; Palettes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,13,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,13,0\"\u003eChapter XIV:\u003c\/b\u003e Calibration - The Standard Printing Time\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,14,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,14,0\"\u003eChapter XV:\u003c\/b\u003e Calibration - Determining the Negative Density Range\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,15,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,15,0\"\u003eChapter XVI:\u003c\/b\u003e Calibration - Determining The Custom Process Adjustment Curve for a Linearized Print\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,16,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,16,0\"\u003eChapter XVII:\u003c\/b\u003e Making a Digital Negative and a Print\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,17,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,17,0\"\u003eChapter XVIII:\u003c\/b\u003e Evaluating the Print\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,18,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,18,0\"\u003eChapter XIX:\u003c\/b\u003e Chemistry or Curve - When to Use One, the Other, or Both\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,19,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,19,0\"\u003eChapter XX:\u003c\/b\u003e The Future\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"18\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"18\"\u003eAppendices:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"19\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"19,0,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"19,0,0\"\u003eAppendix A:\u003c\/b\u003e Glossary of Terms\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"19,1,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"19,1,0\"\u003eAppendix B:\u003c\/b\u003e Suggested Reading\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"19,2,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"19,2,0\"\u003eAppendix C:\u003c\/b\u003e Resources\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"19,3,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"19,3,0\"\u003eAppendix D:\u003c\/b\u003e Links\u003cbr\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cem\u003e\u003cstrong\u003eLook For Exciting New Printmaking Concepts and Workflows Coming Soon from Precision Digital Negatives!\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cem\u003e📥 Digital product — once your download is initiated, no refunds can be issued. If you experience a technical issue accessing your file, contact minelson@mac.com within 14 calendar days and we'll resend it promptly.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":46345390751965,"sku":"","price":75.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0752\/2094\/3069\/files\/PDNLogoFinal45.jpg?v=1770072370"},{"product_id":"media-and-entertainment-example-product-1","title":"Standardized Film 31 Step Tablet","description":"\u003cp\u003eThe PDN 31-Step Tablet (Designed by Mark I. Nelson) Precision matters. Achieve superior evaluation and linearization with 1\/3-stop precision. The PDN 31-Step Tablet is the standard for digital negative calibration, designed specifically to address the limitations of traditional sensitivity guides. The Standardize Step Tablet is the Universal Yardstick for evaluation and comparison of calibrations, it allows you to communicate your results accurately with other photographers. This is a physical film Step Tablet on silver gelatin film. It is NOT an inkjet tonal palette. It is the Most Valuable and the Cheapest item in your array of darkroom equipment. (If you graph the print densities resulting from printing the standardized step tablet, you will have defined your process H\u0026amp;D curve.)\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eA Simple Tool Tells The Big Story\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDetermine The Standard Printing Time of Your Process\u003c\/li\u003e\n\u003cli\u003eDetermine the Exposure Scale of Your Process\u003c\/li\u003e\n\u003cli\u003eDetermine DMax and DMin of Your Process\u003c\/li\u003e\n\u003cli\u003eDetermine the Density Requirements of Your Negatives\/Positives\u003c\/li\u003e\n\u003cli\u003eCompare and Evaluate Chemistry Ratio Adjustments\u003c\/li\u003e\n\u003cli\u003eCompare and Evaluate the Huge Impact Moisture Content has on Exposure Scale\u003c\/li\u003e\n\u003cli\u003eCompare and Evaluate Papers\u003c\/li\u003e\n\u003cli\u003eCompare and Evaluate Other Workflow Variables\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhy the PDN 31-Step Tablet?\u003c\/strong\u003e While many standard tablets use Log .15 Density (1\/2-stop) increments, this custom tablet refines the scale to Log .10 Density (1\/3 stop). This tighter spacing provides 50% more data points for your linearization software, resulting in smoother gradients and more accurate profiles.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features \u0026amp; Usability:\u003c\/strong\u003e Reversed Numbers: Numbers are printed in reverse on the film, so they read correctly (emulsion side down) on your final print. Visual Clarity: Features black \u0026amp; white edges for improved visual evaluation and tick marks to clearly indicate step borders. Easier Handling: Wide steps allow for easier \"lapping\" of the substrate, and the step sizes are optimized for accurate densitometer readings. Versatile: Works perfectly for Platinum\/Palladium, Cyanotype, and Positive Processes such as Photopolymer Gravure \u0026amp; Copper Plate Photogravure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTechnical Specifications:\u003c\/strong\u003e Precision: Each step is Log .10 Density (1\/3 Stop). Exposure Calculation: Three Steps = 1 Stop Exposure. Range: Approx. 10 Stops of Density\/Exposure (Step #1 = Log .05 to Step #31 = Log 3.05). Dimensions: 1 in. x 7 in. (Strip format). Designed by: Mark I. Nelson. Manufactured by: Stouffer Industries (Custom produced for Precision Digital Negatives, Inc.)\u003c\/p\u003e\u003cp\u003e📦 \u003cstrong\u003eReturns:\u003c\/strong\u003e 14-day returns accepted. Item must be returned in original condition before a refund is issued. Return shipping is at the customer's expense. \u003ca href=\"https:\/\/precisiondigitalnegatives.com\/policies\/refund-policy\"\u003eView our full Refund Policy\u003c\/a\u003e.\u003c\/p\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":47089483972829,"sku":null,"price":39.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0752\/2094\/3069\/files\/PDN31Step.jpg?v=1769377834"},{"product_id":"media-and-entertainment-example-product-2","title":"Wave Rocker","description":"\u003cp\u003e\u003cstrong\u003eWAVE ROCKER (Patent Pending)\u003c\/strong\u003e The Professional Solution for Automated Printmaking Workflow\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eReclaim Your Creative Energy\u003c\/strong\u003e Are you tired of the tedious, manual tray processing that steals your focus? Whether you are working with Platinum Prints, Sheet Films, or other alternative processes, manual rocking is a bottleneck. The WAVE ROCKER is a revolutionary, motorized tray rocker designed to automate the tiring tasks of the darkroom. This compact powerhouse frees you from the sink, allowing you to focus on your artwork while ensuring a more consistent, higher-quality development for every print.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy Choose the Wave Rocker?\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSuperior Dual-Direction Action: Moves chemistry in two directions simultaneously, ensuring fresh chemicals are constantly reaching the paper or film surface.\u003c\/li\u003e\n\u003cli\u003eUniversal Compatibility: Accommodates any size tray without modification.\u003c\/li\u003e\n\u003cli\u003ePrecision Control: Easily adjusted for optimal wave action across different tray sizes.\u003c\/li\u003e\n\u003cli\u003eUltra-Portable: Fits in the palm of your hand and stores in minutes. No large footprint or permanent sink installation required.\u003c\/li\u003e\n\u003cli\u003ePlug \u0026amp; Play: Quick to set up, take down, and store, making it perfect for shared labs or small home darkrooms.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eTechnical Specifications \u0026amp; Shipping\u003c\/strong\u003e Included: Motorized base unit, power adapter, and toggle switch. Origin: Designed and crafted by Mark Nelson. Shipping: Flat-rate $25.00 shipping within the United States.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eVolume Orders:\u003c\/strong\u003e Purchasing multiple units or interested in institutional pricing? Email \u003ca href=\"mailto:MINelson@mac.com\"\u003eMINelson@mac.com\u003c\/a\u003e with your inquiry.\u003c\/p\u003e\u003cp\u003e📦 \u003cstrong\u003eReturns:\u003c\/strong\u003e 14-day returns accepted. Item must be returned in original condition before a refund is issued. Return shipping is at the customer's expense. \u003ca href=\"https:\/\/precisiondigitalnegatives.com\/policies\/refund-policy\"\u003eView our full Refund Policy\u003c\/a\u003e.\u003c\/p\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":47089484038365,"sku":null,"price":250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0752\/2094\/3069\/files\/TrayRockerStoreImage.jpg?v=1769535731"},{"product_id":"media-and-entertainment-example-product-3","title":"Aquatint Screens","description":"\u003cp\u003eAquatint Screens for Photopolymer Gravure and Copper Plate Photogravure. Custom screens produced by Mark I Nelson of Precision Digital Negatives. Users report these are the finest screens they have ever used. Mark spent a year developing these screens and tested more than 20 different formulas for length and smoothness of tonal scale and for printing fine detail.\u003c\/p\u003e\u003cp\u003eThe screens come in 5 different sizes. 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