Meiji MA792 Auxiliary Lens for EMZ-8 — 0.35X Magnification, 250mm Working Distance

The Meiji MA792 is a 0.35X auxiliary objective lens engineered specifically for the Meiji EMZ-8 stereo microscope. It dramatically increases working distance to approximately 250mm while widening the field of view—making it ideal for large parts, tall fixtures, and inspection or rework tasks that demand exceptional clearance and operator freedom.

Quick selection note: MA792 is chosen when clearance and coverage matter more than raw magnification. It enables hands-on work, probing, and tooling under the microscope without constant collisions or repositioning.

Specifications:

Accessory type: Auxiliary lens (auxiliary objective / “Barlow” style)
Magnification factor: 0.35X
Working distance (W.D.): ~250mm (9.8")
Compatible microscope body: Meiji EMZ-8 stereo microscope
Primary effect: Increases clearance and field of view; reduces effective magnification
Use intent: Large parts, tall fixtures, tool-intensive inspection and rework

Where MA792 Fits in Cleanrooms and Laboratories (and Why)

MA792 is commonly selected for production inspection, assembly, and rework stations where the physical size of the part—or the need for tools and fixtures—makes standard working distances impractical. The extended 250mm clearance reduces operator fatigue, minimizes accidental contact with optics, and improves workflow efficiency.

Typical program fit: electronics assembly and rework, medical device assembly, precision mechanical inspection, and cleanroom benches where tall components or fixtures are unavoidable.

By prioritizing clearance and coverage, MA792 supports efficient manipulation and reduces the need to move parts in and out of the cleanroom or between benches—lowering handling risk and improving throughput.

MA792 Features:

0.35X auxiliary lens designed specifically for the EMZ-8 platform
Very long 250mm working distance for maximum clearance
Wider field of view for large-area scanning and orientation
Supports tool-intensive and fixture-based workflows

MA792 Benefits:

Exceptional clearance: enables comfortable use of probes, tweezers, soldering tools, and fixtures.
Improved ergonomics: reduces neck, shoulder, and hand strain during long inspection or assembly cycles.
Workflow efficiency: fewer collisions and less repositioning improves consistency and speed.
Large-part capability: accommodates oversized components without compromising visibility.

Common Applications:

Electronics assembly and rework under magnification
Inspection of large or tall medical device components
Mechanical assemblies requiring frequent tool access
Cleanroom production benches with tall fixtures or jigs

Selection Notes (MA792 vs. Higher-Factor Auxiliary Lenses)

If detail resolution is limiting: consider higher factors (0.5X, 0.75X, 1.0X+) with reduced working distance.
If clearance and manipulation are limiting: MA792 (0.35X) is often the optimal solution.
Program best practice: standardize auxiliary lens factor by station role (assembly vs. confirm inspection).

Optics Cleaning (Recommended for Extended-Working-Distance Setups)

Extended working distance increases exposure to airborne particles and handling contamination. Use optical-grade swabs and low-lint specialty wipers to maintain contrast and prevent haze on coated optics.

Link to Meiji MA792 Product Details: Manufacturer Product Page

Notes: Auxiliary lens selection should be treated as a controlled configuration decision. For help balancing clearance, coverage, and detail across inspection benches, consult the SOSCleanroom Technical Vault.

The Technical Vault

By SOSCleanroom

Last reviewed: Jan. 21, 2026

Why and When to Use a 0.35X Auxiliary Lens on a Stereo Microscope

Meiji MA792 — extreme working distance, clearance-driven workflows, and cleanroom ergonomics

The one-paragraph answer

The Meiji MA792 is a 0.35X auxiliary lens for the EMZ-8 stereo microscope that extends working distance to approximately 250mm. It is used when inspection, assembly, or rework tasks are limited by physical clearance rather than magnification. In practice, MA792 enables safer manipulation, better ergonomics, and more stable workflows for large or tall components in cleanroom and laboratory environments.

Stereo microscope engineering vs. compound microscope engineering

Stereo microscopes use dual optical paths to deliver true depth perception, which is essential for manipulation and assembly tasks. Auxiliary lenses like MA792 modify the system to favor clearance and coverage—capabilities that compound microscopes are not designed to provide.

Workflow guidance: when MA792 is the right tool