Aperture Stop/Iris: Diameter Range 1mm to 50mm

Component Specifications

Definition

An aperture stop, commonly called an iris, is a mechanical component in optical lens assemblies that functions as a variable diaphragm. It consists of overlapping blades arranged in a circular pattern that can be adjusted to change the diameter of the central opening. This controls the amount of light passing through the optical system, regulates the numerical aperture, and affects depth of field, resolution, and image quality. In industrial applications, it's critical for precision imaging, microscopy, photography, and optical measurement systems.

Working Principle

The aperture stop operates on the principle of adjustable obstruction. Multiple thin metal blades are arranged radially and connected to a control mechanism. When adjusted, the blades move simultaneously to create a circular opening of variable diameter. This opening acts as the limiting aperture that determines which light rays from the object pass through the optical system. Smaller openings increase depth of field but reduce light intensity, while larger openings allow more light but decrease depth of field.

Materials

Typically made from stainless steel (grades 304 or 316 for corrosion resistance), aluminum alloys (for lightweight applications), or specialized plastics (for cost-sensitive applications). Blades are precision-stamped or laser-cut with thickness ranging from 0.1mm to 0.5mm. Surface treatments include black anodizing (aluminum) or black oxide coating (steel) to minimize light reflection.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Control Type	Manual, Electric, or Pneumatic
Mounting Type	C-mount, CS-mount, or Custom
Repeatability	±0.01mm
Blade Material	Stainless Steel 304/316
Diameter Range	1mm to 50mm
Number Of Blades	5 to 15 blades
Operating Temperature	-20°C to +80°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 10110, ISO 9022, DIN 3140, DIN 58185

Parent Products

This component is used in the following industrial products

Optical Lens Assembly

A precision optical component system that focuses light onto the sensor in a line scan camera.

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Engineering Analysis

Risks & Mitigation

Mechanical wear of blade pivots
Contamination accumulation on blades
Calibration drift over time
Inconsistent aperture shape at small openings
Light leakage through blade gaps

FMEA Triads

Trigger: Wear in blade pivot mechanisms
Failure: Irregular aperture shape, inconsistent light control
Mitigation: Use hardened steel bushings, regular lubrication, implement wear monitoring

Trigger: Contamination buildup on blade surfaces
Failure: Reduced light transmission, scattered light, image artifacts
Mitigation: Sealed housing design, regular cleaning protocols, cleanroom installation when possible

Trigger: Control mechanism backlash
Failure: Poor repeatability, inaccurate aperture settings
Mitigation: Anti-backlash gears, precision stepper motors, closed-loop feedback systems

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Aperture diameter tolerance: ±0.02mm or 2% of setting, whichever is greater. Circularity tolerance: 0.01mm maximum deviation from perfect circle.

Test Method

ISO 9039 for measurement of aperture diameter, ISO 15795 for optical distortion testing, visual inspection under 10x magnification for blade alignment and surface defects.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

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Manufacturers of Aperture Stop/Iris

Manufacturer profiles associated with Aperture Stop/Iris.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between aperture stop and field stop?

The aperture stop controls the brightness and depth of field by limiting the cone of light entering the system, while the field stop controls the field of view by limiting the size of the image formed.

How does the number of blades affect optical performance?

More blades create a more circular aperture shape, resulting in smoother out-of-focus areas (bokeh) and more consistent light transmission. Fewer blades create polygonal aperture shapes that can affect diffraction patterns.

Can aperture stops be automated in industrial applications?

Yes, electric and pneumatic iris mechanisms allow for automated control, enabling dynamic adjustment during operation for applications like machine vision, automated microscopy, and adaptive optical systems.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Aperture Stop/Iris