Precision Spacer for Metabones Adapters | Extended Clearance Block

The Hejnar Photo Precision Spacer Block is a dedicated structural correction component custom-designed for Metabones (Gen 2, Gen 3, and Gen 4) smart adapters. Engineered to fit seamlessly between the adapter chassis and the mounting foot, this high-stiffness riser block increases vertical offset to provide essential physical clearance. It completely resolves hardware clearance issues when deploying large-diameter lenses, wide quick-release platforms, or vertical camera L-brackets on professional tripods and monopods.

Quick Overview & Key Features

• Dedicated Adapter Compatibility: Custom-machined block profile engineered specifically to index perfectly with the base channels of Metabones Gen 2, Gen 3, and Gen 4 lens adapters.
• Critical Height Riser Profile: Adds crucial vertical spacing to prevent large-barrel lenses or bulky camera L-brackets from physically striking tripod pan knobs and monopod plates.
• Anti-Twist Alignment Channels: Precision-milled geometric seating tracks completely eliminate shifting, twisting, or mechanical play between the adapter body and the foot under heavy torque loads.
• Uncompromised Structural Rigidity: Solid unibody metal block design eliminates the flex, wobble, and play associated with stacking crude universal washers or third-party spacers.
• Streamlined Integration: Maintains a low-profile, clean system aesthetic while maximizing flat metal-on-metal clamping surface area contact.
• Premium US Craftsmanship: Precision CNC-machined from a solid block of high-grade 6061-T6 aircraft aluminum.
• Durable Hard-Coat Finish: Treated with a satin black hard-coat anodized surface layer for advanced resistance against scuffs, scratches, and harsh outdoor field elements.
• Complete Assembly Hardware: Supplied with high-tensile, corrosion-resistant stainless steel mounting screws custom-lengthened to ensure absolute structural safety.

Technical Specifications

• Product Category: Lens Mount Adapter Extension Riser / Spacer
• Supported Adapter Generations: Metabones Gen 2, Gen 3, and Gen 4
• Material Construction: CNC-Milled 6061-T6 Aircraft Aluminum
• Hardware Pack: High-tensile stainless steel extended connection fasteners
• Exterior Finish Layer: Scratch-Resistant Black Hard-Coat Anodization
• Country of Origin: Proudly Made in the USA

Product Description

The Hejnar Photo Precision Spacer Block for Metabones solves a frustrating and persistent clearance design bottleneck commonly encountered by landscape, wildlife, and event photographers deploying adapted lens systems. The factory foot layout on original Metabones adapters sits exceptionally close to the primary lens axis. Consequently, when trying to lock your camera system onto wide tripod platforms, large monopod tilt-heads, or universal Arca-Swiss quick-release receiver clamps, the bulky barrel of fast-aperture lenses or the vertical wing of an L-bracket will physically bottom out against the support hardware. This prevents a clean lock, jams the plate slider slots, and puts dangerous leverage strain on your lens mount.

This custom-engineered spacer blocks provides a permanent, elegant physical fix. Installed directly between the adapter body and your existing plate or replacement foot, it delivers the exact vertical lift required to let wide optics and corner brackets clear your support equipment cleanly. Because close-up macro imaging and telephoto tracking place intense torsional stress on your gear joints, this block is built with precision index tracking channels that seat flush against the hardware. This design choice completely removes stack tolerance errors and dampens micro-vibrations, giving you an ultra-rigid connection that will not slip over time.

Bespoke-crafted in the USA from ultra-strong aircraft aluminum, this spacer ensures your optical center remains perfectly squared and true to your tracking axis. The kit includes extended high-tensile fasteners that pass cleanly through the spacer body to ensure deep, maximum-security thread engagement inside the adapter body. Finished with a rugged black hard coat built to withstand severe field use, this spacer block delivers the mechanical precision, safety margin, and lifelong reliability your camera rig requires.