50mm Adjusting Screw Macro Focusing Rail | Precision 20 TPI

This precision-engineered 50mm adjusting screw macro rail 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 precision 20 TPI (threads per inch) adjustment screw, this stage delivers fast yet fine positioning adjustments without the premium cost of sub-millimeter micrometers.

Quick Overview & Key Features

• Precision Travel Range: Delivers 0 to 50mm of fluid linear travel for fine-tuning camera-to-subject focal distances.
• Precision 20 TPI Lead Screw: 20 turns per inch mechanism enables a perfect balance of smooth, responsive travel and precise incremental positioning.
• Cost-Effective Micro Alignment: Serves as an affordable, high-precision alternative to industrial micrometers when physical scale readouts are not required.
• 4-Position Indexable Clamp: Integrated quick release slider clamp can be rotated and locked securely in 4 distinct orientations using the center screw and robust alignment dowel pins.
• Vertical Weight Capacity: Supports up to a 10 lbs load when configured in a 90-degree orientation (completely perpendicular to the ground).
• Horizontal Weight Capacity: Effortlessly holds up to a 15 lbs load when locked in a horizontal orientation (completely parallel to the ground).
• Universal Arca Standard: Dovetail profile on the base rail ensures a flawless, wiggle-free fit inside standard quick release clamps from RRS, Kirk, Wimberley, and Leofoto.
• Premium Materials & Finish: Precision CNC-machined from solid 6061-T6 aircraft-grade aluminum with a durable black hard-coat anodized surface.
• Made in the USA: Proudly manufactured to rigorous professional tolerances with corrosion-resistant stainless steel driving hardware.

Product Description

The premium Hejnar Photo 50mm Adjusting Screw Macro Rail (20 TPI) 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 20 TPI lead screw drive, allowing you to fluidly and quickly shift your camera plane forward or backward to locate critical detail with absolute certainty.

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 4 separate positions. 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.

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.