50mm Adjusting Screw Macro Focusing Rail | High-Precision 100 TPI

This premium 50mm adjusting screw macro rail is an ultra-precise, high-performance linear stage custom-designed for extreme close-up photography, scientific imaging, and focus stacking workflows. Featuring a built-in Arca-Swiss compatible base track and an integrated quick release receiver clamp, it allows for exceptionally fine focus modifications. Driven by a high-precision 100 TPI (threads per inch) adjustment screw, this stage delivers micro-incremental positioning 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.
• High-Precision 100 TPI Lead Screw: Ultra-fine pitch (100 turns per inch) mechanism enables precise sub-millimeter positional increments.
• 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 finish.
• 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 is an essential technical asset for serious macro, forensic, and entomology photographers who require flawless stability during extreme magnification imaging. Because tiny shifts in distance dramatically alter the depth of field when shooting past 1:1 ratios, generic rack-and-pinion rails lack the necessary fine-control mechanism. This stage overcomes that physical constraint with its high-precision 100 TPI lead screw drive, allowing you to fluidly shift your lens plane forward or backward in microscopic increments to locate critical detail with absolute certainty.

A core mechanical advantage 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 image stacking demands.