8" Arca-Swiss Screw Adjusting Macro Rail with Precision Scale

The Hejnar Photo 8-Inch Screw Adjusting Macro Rail with Scale is a precision-engineered tool designed for high-end macro photography and focus stacking. This rail features a sophisticated lead screw drive that allows for sub-millimeter camera-to-subject distance adjustments. Built with an Arca-Swiss compatible dovetail base and a modular quick-release clamp, it offers a rock-solid foundation for professional camera rigs. Proudly made in the USA, this rail is finished with a ceramic-coated aluminum shell for ultimate durability and corrosion resistance.

Quick Overview & Key Features

• Precision Lead Screw Drive: Delivers exactly 1.06 mm of travel per full revolution for ultra-fine focus control.
• Dual-Speed Positioning: Use the slider release button for rapid coarse framing, then engage the knob for precise micro-adjustments.
• Self-Aligning Linear Sleeve Bearings: Features a nonabrasive, chemical-resistant PTFE liner that is virtually maintenance-free and requires no lubrication.
• 4-Position Quick Release Clamp: The integrated top clamp can be oriented in 90-degree increments to accommodate various camera or L-bracket setups.
• Ceramic-Coated Aluminum Construction: The aluminum shell features a 0.002" thick ceramic coating, providing superior protection in extreme temperatures from –400° to +375° F.
• Arca-Swiss Compatibility: The 8.00" bottom rail features a dovetail profile compatible with RRS, Kirk, Wimberley, and other standard clamps.
• High Load Capacity: Supports up to 15 lbs in a horizontal orientation and up to 10 lbs when positioned vertically.

Comprehensive Product Description

The 8-Inch Screw Adjusting Macro Rail with Scale is a true professional-grade component for technical photographers. By moving the entire camera rig instead of the lens focus ring, this rail allows for precise focus stacking while maintaining a consistent reproduction ratio. With an overall length of 10.50 inches and a 3.5-inch maximum travel distance (88mm), it provides a generous range of movement for complex macro subjects.

Durability is at the core of this design. The rail utilizes self-aligning linear sleeve bearings with a PTFE liner, ensuring smooth, friction-free movement without the need for traditional grease that can attract dust and debris. The aluminum housing is treated with a specialized 0.002" ceramic coating, making it highly resistant to corrosion and wear in challenging field conditions.

The integrated precision scale allows for repeatable alignment, which is critical for scientific and industrial workflows. The bottom rail dovetail interfaces seamlessly with Arca-style tripod heads, while the top quick-release clamp can be repositioned in four different orientations. Whether you are balancing a heavy telephoto setup horizontally or shooting at a vertical 90-degree angle, this rail offers the stability and control needed for razor-sharp macro results.