{"product_id":"50mm-adjusting-screw-macro-focusing-rail-20-tpi","title":"50mm Adjusting Screw Macro Focusing Rail | Precision 20 TPI","description":"\u003c!-- ===================== GRAY BANNER ===================== --\u003e \n\u003cdiv style=\"background:#e5e5e5;padding:12px 15px;margin-bottom:18px;\"\u003e \n    \u003cstrong\u003eArca-Swiss Style 50mm Adjusting Screw Macro Rail (Precision 20 TPI)\u003c\/strong\u003e \n\u003c\/div\u003e \n\n\u003c!-- ===================== SEO BLOCK (TOP) ===================== --\u003e \n\u003ch1\u003e50mm Adjusting Screw Macro Focusing Rail | Precision 20 TPI\u003c\/h1\u003e \n\u003cp\u003e\n    This precision-engineered \u003cstrong\u003e50mm adjusting screw macro rail\u003c\/strong\u003e is a reliable, high-performance linear stage custom-designed for close-up photography, field macro tracking, and focus stacking workflows. Featuring a built-in Arca-Swiss compatible base track and an integrated quick release receiver clamp, it allows for smooth focus modifications. Driven by a \u003cstrong\u003eprecision 20 TPI (threads per inch) adjustment screw\u003c\/strong\u003e, this stage delivers fast yet fine positioning adjustments without the premium cost of sub-millimeter micrometers.\n\u003c\/p\u003e \n\u003chr\u003e \n\n\u003c!-- ===================== QUICK OVERVIEW \u0026 KEY FEATURES ===================== --\u003e \n\u003ch2\u003eQuick Overview \u0026amp; Key Features\u003c\/h2\u003e \n\u003cul\u003e \n    \u003cli\u003e\n\u003cstrong\u003ePrecision Travel Range:\u003c\/strong\u003e Delivers 0 to 50mm of fluid linear travel for fine-tuning camera-to-subject focal distances.\u003c\/li\u003e \n    \u003cli\u003e\n\u003cstrong\u003ePrecision 20 TPI Lead Screw:\u003c\/strong\u003e 20 turns per inch mechanism enables a perfect balance of smooth, responsive travel and precise incremental positioning.\u003c\/li\u003e \n    \u003cli\u003e\n\u003cstrong\u003eCost-Effective Micro Alignment:\u003c\/strong\u003e Serves as an affordable, high-precision alternative to industrial micrometers when physical scale readouts are not required.\u003c\/li\u003e \n    \u003cli\u003e\n\u003cstrong\u003e4-Position Indexable Clamp:\u003c\/strong\u003e Integrated quick release slider clamp can be rotated and locked securely in 4 distinct orientations using the center screw and robust alignment dowel pins.\u003c\/li\u003e \n    \u003cli\u003e\n\u003cstrong\u003eVertical Weight Capacity:\u003c\/strong\u003e Supports up to a 10 lbs load when configured in a 90-degree orientation (completely perpendicular to the ground).\u003c\/li\u003e \n    \u003cli\u003e\n\u003cstrong\u003eHorizontal Weight Capacity:\u003c\/strong\u003e Effortlessly holds up to a 15 lbs load when locked in a horizontal orientation (completely parallel to the ground).\u003c\/li\u003e \n    \u003cli\u003e\n\u003cstrong\u003eUniversal Arca Standard:\u003c\/strong\u003e Dovetail profile on the base rail ensures a flawless, wiggle-free fit inside standard quick release clamps from RRS, Kirk, Wimberley, and Leofoto.\u003c\/li\u003e \n    \u003cli\u003e\n\u003cstrong\u003ePremium Materials \u0026amp; Finish:\u003c\/strong\u003e Precision CNC-machined from solid 6061-T6 aircraft-grade aluminum with a durable black hard-coat anodized surface.\u003c\/li\u003e \n    \u003cli\u003e\n\u003cstrong\u003eMade in the USA:\u003c\/strong\u003e Proudly manufactured to rigorous professional tolerances with corrosion-resistant stainless steel driving hardware.\u003c\/li\u003e \n\u003c\/ul\u003e \n\n\u003c!-- ===================== PRODUCT DESCRIPTION ===================== --\u003e \n\u003ch2\u003eProduct Description\u003c\/h2\u003e \n\u003cp\u003e \n    The premium \u003cstrong\u003eHejnar Photo 50mm Adjusting Screw Macro Rail (20 TPI)\u003c\/strong\u003e is an essential technical asset for serious macro, landscape, and outdoor close-up photographers who require absolute stability during high-magnification imaging. Because tiny shifts in distance dramatically alter the depth of field when shooting close-up ratios, standard tripod heads lack the necessary control. This stage overcomes that physical constraint with its precision \u003cstrong\u003e20 TPI lead screw drive\u003c\/strong\u003e, allowing you to fluidly and quickly shift your camera plane forward or backward to locate critical detail with absolute certainty.\n\u003c\/p\u003e \n\u003cp\u003e \n    A core mechanical feature of this model is its fully customizable, indexable slider stage. By utilizing a unified locking center screw paired with heavy-duty anti-twist indexing dowel pins, the quick release clamp can be re-oriented into \u003cstrong\u003e4 separate positions\u003c\/strong\u003e. This design lets you easily choose whether the clamp opens parallel or perpendicular to the adjustment rail, making it completely adaptable to varying camera brackets, base plates, or telephoto lens collars. \n\u003c\/p\u003e \n\u003cp\u003e \n    Engineered to confidently manage heavy professional setups, this macro rail features a completely rigid unibody frame that eliminates focus drift or sagging. When oriented vertically at a 90-degree angle for copy-stand work or downward laboratory setups, it rigidly supports assemblies weighing up to 10 lbs. For traditional ground-level outdoor tracking, its horizontal load handling expands to a massive 15 lbs capacity. Machined in the USA from solid aluminum with custom-machined steel hardware, this focusing rail delivers the rock-solid tracking performance your technical imagery demands.\n\u003c\/p\u003e","brand":"Hejnar Photo","offers":[{"title":"Default Title","offer_id":67701616902249,"sku":"MS4-20-2","price":399.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0794\/1278\/9353\/files\/0001_MS4-20-2.jpg?v=1793718398","url":"https:\/\/www.hejnarphotostore.com\/products\/50mm-adjusting-screw-macro-focusing-rail-20-tpi","provider":"Hejnar Photo","version":"1.0","type":"link"}