8" Arca-Swiss Screw Adjusting Macro Rail with 0.004" Fine Control

The Hejnar Photo 8-Inch Screw Adjusting Macro Rail is a professional-grade precision instrument designed for high-magnification macro photography and focus stacking. This rail provides microscopic control over camera-to-subject distance, utilizing a lead screw mechanism that delivers incredible 0.004 inch (0.1mm) sensitivity per scale division. Built with an Arca-Swiss compatible dovetail and a modular quick-release clamp, it offers the uncompromising stability required for professional studio and field workflows.

SAE Technical Specifications

• Bottom Rail Length: 8.00 inches
• Maximum Travel Distance: 4.30 inches
• Adjustment Resolution: 0.004 inch (0.1mm) per scale division
• Lead Screw Pitch: 0.0416 inch (1.06mm) travel per full revolution
• Horizontal Load Capacity: 15 lbs (Parallel to ground)
• Vertical Load Capacity: 10 lbs (Perpendicular to ground)
• Finish: 0.002" Thick Ceramic Hard Coat for corrosion resistance
• Temperature Rating: –400° to +375° F

Quick Overview & Key Features

• Fine Precision Drive: High-resolution lead screw allows for flawless focal plane adjustments in sub-millimeter increments.
• Rapid Positioning Button: Instant-release slider button allows for fast coarse framing before engaging the fine screw drive.
• Self-Aligning Linear Bearings: Maintenance-free PTFE-lined bearings provide smooth, nonabrasive travel without the need for lubrication.
• 4-Position Modular Clamp: The Arca-style quick release clamp can be reoriented in 90-degree steps to suit any camera or lens plate orientation.
• Arca-Swiss Standard Base: Integrated bottom dovetail fits standard clamps from RRS, Kirk, Wimberley, and Leofoto.
• Professional Build Quality: CNC-machined from 6061-T6 aircraft-grade aluminum in the USA.

Comprehensive Product Description

The Hejnar Photo 8-Inch Screw Adjusting Macro Rail is a critical tool for photographers working with thin depths of field. By moving the camera rig rather than adjusting the lens focus ring, you maintain a constant reproduction ratio, which is essential for accurate focus stacking and alignment in post-processing.

Engineered for extreme environments, the rail features a specialized 0.002" ceramic coating and a temperature range of –400° to +375° F, making it ideal for everything from lab environments to freezing field conditions. The PTFE-lined bearing system is virtually maintenance-free and chemical-resistant, ensuring that the sliding mechanism remains smooth and free of debris-trapping lubricants.

With its high load capacity of 15 lbs, this rail can securely manage professional DSLR and mirrorless setups with heavy macro lenses. Whether you are performing high-magnification product imaging or botanical field work, this USA-made rail delivers the stability and microscopic precision required for world-class results.