Adjustable Iris Aperture Diaphragm M30 to M37 Adapter - Smooth Control

In this review of the Adjustable Iris Aperture Diaphragm M30 to M37 Adapter, the bottom line is straightforward: it is for photographers and optics technicians who need a compact, mechanically reliable way to control aperture on small objective lenses such as the PVS-14. The single biggest reason to buy is its precise, smooth aperture control in a lightweight, aviation metal housing that adapts a 30 mm front to a 37 mm mount while offering a usable range from 1.5 mm to 26 mm.

Key Features

• M30 to M37 mount: Lets users adapt lenses with a 30 mm front to a 37 mm thread, expanding compatibility with accessory threads and housings.
• Adjustable aperture 1.5-26 mm: Provides a wide, usable iris range so photographers can fine tune light and depth of field for low-light or specialty optics work.
• Compatible with PVS-14 / PVS-31 optics: Designed to pair directly with PVS-14 objective lenses, offering a practical upgrade path for night-vision objective control.
• Aviation metal construction: Durable, lightweight material gives a solid feel and should hold up to repeated mounting and adjustment in field use.
• Smooth motion control: The iris mechanism moves cleanly for precise, repeatable aperture changes without excess play.

Who It's For

This adapter suits technicians, night-vision enthusiasts, and photographers who work with small objective lenses and need mechanical iris control without altering optical elements. It is particularly useful for those who already own PVS-14 or PVS-31 optics and want a compact way to manage exposure and depth of field.

Those who should look elsewhere include users needing electronic aperture control, integrated autofocus, or adapters for larger professional cine lenses; this is a mechanical, manual iris intended for small-diameter optics and mounting compatibility, not a full lens replacement.

Pros & Cons

Pros

• Solid construction from aviation metal gives confidence in durability and everyday handling.
• Wide aperture range (1.5 mm to 26 mm) covers most low-light and precision uses for small objectives.
• Reported smooth motion control makes fine adjustments easy and repeatable in the field.
• Direct compatibility with PVS-14 optics offers a cost-effective upgrade path for night-vision setups.

Cons

• Manual mechanical control means no electronic integration or remote adjustment options.
• Designed for specific small-diameter fronts and PVS optics, so it is not a universal solution for larger lens systems.

Specifications

Mount	M30 to M37
To Fit Lens Front	30 mm, 36 mm
Aperture	Adjustable 1.5-26 mm
Minimum Diameter	1.5 mm
Maximum Diameter	26 mm
Material	Aviation metal
Compatibility	PVS-14 / PVS-31 optics

Our Verdict

The Adjustable Iris Aperture Diaphragm M30 to M37 Adapter is a pragmatic, value-minded choice for users who need manual aperture control on small objective lenses, especially PVS-14 owners. Its durable aviation metal build, broad 1.5-26 mm range, and smooth motion deliver reliable, repeatable performance at a fraction of the cost of more elaborate optics modules.

Frequently Asked Questions

Will this fit my PVS-14 objective lens?
Yes, it is specifically compatible with PVS-14 optics and several customers report it fits the PVS-14 objective lens directly.

What aperture range does it provide?
The iris adjusts from a minimum diameter of 1.5 mm up to a maximum of 26 mm for flexible light control.

What is the housing made from?
The adapter uses aviation metal for a lightweight but durable construction suitable for repeated field use.