Adjustable Iris Aperture Diaphragm M30 to M37 Adapter - Compact NV

In this review the Adjustable Iris Aperture Diaphragm adapter is evaluated as a simple, mechanical upgrade for compact night vision optics and related lenses. It is aimed at users who need variable control over incoming light without electronics, and the single biggest reason to buy is the precise physical iris range from 1.5mm to 26mm that lets you tailor image brightness and depth for PVS-14 style setups and other compatible optics. The review focuses on build, operation and practical fit for hands-on users.

Key Features

• Adjustable aperture range: The iris covers a minimum diameter of 1.5mm up to 26mm so users can dial in exposure and depth effects across varied lighting conditions.
• M30 to M37 compatibility: The threaded sizes let the adapter fit lenses and accessories with common M30 to M37 threads for flexible installation.
• Solid construction: Made from aviation metal, the adapter offers a rugged feel and reliable performance for field use.
• Simple manual control: The external handle lets you change diaphragm diameter directly, making on-the-fly adjustments fast and tactile.
• Complete pack: The set includes two adjustable iris units plus two 37mm UV lenses and two 37mm protective covers so components can be combined or swapped as needed.

Who It's For

The adapter pack is best for hobbyists, technicians, and night vision enthusiasts using PVS-14 style devices who want a mechanical way to control aperture without adding electronics. It suits users who value physical reliability and clear, repeatable adjustments and who often work in variable illumination where controlling the iris improves image usability.

It is not ideal for people who require motorized or remote aperture control, those who need factory-matched optical calibration for complex imaging systems, or users who cannot work with threaded lens adapters and manual handles. If you need electronic integration or very fine motorized steps, look elsewhere.

Pros & Cons

Pros

• Sturdy aviation metal build gives a durable, workshop-ready feel.
• Wide aperture span of 1.5mm to 26mm allows significant control over image brightness and depth.
• Comes as a useful kit with two iris units, two 37mm UV lenses, and two covers for immediate use.
• Direct manual handle control is intuitive and fast for field adjustments.

Cons

• Some users report inconsistent rotation feel, so the iris engagement can vary between units.
• Manual operation lacks motorized precision for remote or repeatable automated setups.

Specifications

Product type	Adjustable iris diaphragm adapter
Aperture range	1.5mm to 26mm
Thread sizes	M30 to M37
Included items	2x adjustable iris M30M37, 2x 37mm UV lens, 2x 37mm protective cover
Material	Aviation metal
Operation	Manual handle adjustment

Our Verdict

This adapter pack is a pragmatic, value-focused choice for users who need manual, durable aperture control on PVS-14 style optics and other threaded lenses. It offers a broad iris range and solid materials, making it good value for field use and retrofit projects, but it may not suit setups that require motorized or remote-controlled precision.

Frequently Asked Questions

Will this fit a PVS-14 night vision device?
Yes, it is designed for use with PVS-14 style devices and other equipment that accept M30 to M37 threaded adapters.

Does the pack include protective lenses?
Yes, the set includes two 37mm UV lenses and two 37mm protective covers for combined or separate use.

Is the aperture motorized?
No, the diaphragm is manually adjusted using the external handle for tactile control.